wolfssl: patch CVE-2026-10098

CVE-2026-10098-1.patch is needed to cherry-pick the commit mentioned in the
PR[1]

Details:
https://nvd.nist.gov/vuln/detail/cve-2026-10098

[1]https://github.com/wolfSSL/wolfssl/pull/10554/commits

Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
This commit is contained in:
Ankur Tyagi authored and Anuj Mittal committed 2026-09-15 10:13:37 +05:30
1 parent c12fcc9b48
commit 6e7213f4d5
3 files changed
+496

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@@ -0,0 +1,368 @@
From d2dca1bdcb6dc5f6fb02c44a042130cd11d27cd0 Mon Sep 17 00:00:00 2001
From: Colton Willey <colton@wolfssl.com>
Date: Mon, 13 Apr 2026 20:29:50 -0700
Subject: [PATCH] Fix NULL derefs, buffer overflow, and i2d contract in
EVP/OCSP/X509
Harden OpenSSL compatibility layer against NULL pointers, negative lengths,
and buffer overflows across EVP, OCSP, and X509 APIs. Fix DSA SignFinal
write-before-check overflow, add missing i2d_OCSP_RESPONSE allocation path,
and fix unaligned keyUsage access.
(cherry picked from commit 58a27848a800aadca91f606dc4fe5234b9971011)
CVE: CVE-2026-10098
Upstream-Status: Backport [https://github.com/wolfSSL/wolfssl/commit/58a27848a800aadca91f606dc4fe5234b9971011]
Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
---
src/ocsp.c | 39 +++++++++++++++++++++++++------
src/ssl.c | 8 ++++++-
src/x509.c | 12 ++++++++--
tests/api.c | 2 +-
wolfcrypt/src/evp.c | 50 ++++++++++++++++++++++++++++++++--------
wolfcrypt/src/pwdbased.c | 3 +++
6 files changed, 94 insertions(+), 20 deletions(-)
diff --git a/src/ocsp.c b/src/ocsp.c
index 2fff7ced5..9de23cb9e 100644
--- a/src/ocsp.c
+++ b/src/ocsp.c
@@ -749,7 +749,9 @@ int wolfSSL_OCSP_resp_find_status(WOLFSSL_OCSP_BASICRESP *bs,
single = bs->single;
while (single != NULL) {
- if ((XMEMCMP(single->status->serial, id->status->serial, (size_t)single->status->serialSz) == 0)
+ if (single->status != NULL && id->status != NULL &&
+ (XMEMCMP(single->status->serial, id->status->serial,
+ (size_t)single->status->serialSz) == 0)
&& (XMEMCMP(single->issuerHash, id->issuerHash, OCSP_DIGEST_SIZE) == 0)
&& (XMEMCMP(single->issuerKeyHash, id->issuerKeyHash, OCSP_DIGEST_SIZE) == 0)) {
break;
@@ -757,7 +759,7 @@ int wolfSSL_OCSP_resp_find_status(WOLFSSL_OCSP_BASICRESP *bs,
single = single->next;
}
- if (single == NULL)
+ if (single == NULL || single->status == NULL)
return WOLFSSL_FAILURE;
if (status != NULL)
@@ -1108,6 +1110,9 @@ int wolfSSL_OCSP_basic_verify(WOLFSSL_OCSP_BASICRESP* bs,
int embedded;
DecodedCert *cert = NULL;
+ if (bs == NULL)
+ return WOLFSSL_FAILURE;
+
ret = OcspFindSigner(bs, certs, &cert, &embedded, flags);
if (ret != 0) {
WOLFSSL_MSG("OCSP no signer found");
@@ -1300,15 +1305,31 @@ int wolfSSL_i2d_OCSP_RESPONSE(OcspResponse* response,
if (response == NULL)
return BAD_FUNC_ARG;
+ if (response->source == NULL)
+ return BAD_FUNC_ARG;
+
if (data == NULL)
return (int)response->maxIdx;
- XMEMCPY(*data, response->source, response->maxIdx);
+ if (*data == NULL) {
+ *data = (unsigned char*)XMALLOC(response->maxIdx, NULL,
+ DYNAMIC_TYPE_OPENSSL);
+ if (*data == NULL)
+ return -1;
+ XMEMCPY(*data, response->source, response->maxIdx);
+ }
+ else {
+ XMEMCPY(*data, response->source, response->maxIdx);
+ *data += response->maxIdx;
+ }
+
return (int)response->maxIdx;
}
int wolfSSL_OCSP_response_status(OcspResponse *response)
{
+ if (response == NULL)
+ return -1;
return response->responseStatus;
}
@@ -1335,8 +1356,12 @@ const char *wolfSSL_OCSP_response_status_str(long s)
WOLFSSL_OCSP_BASICRESP* wolfSSL_OCSP_response_get1_basic(OcspResponse* response)
{
WOLFSSL_OCSP_BASICRESP* bs;
- const unsigned char *ptr = response->source;
+ const unsigned char *ptr;
+ if (response == NULL || response->source == NULL)
+ return NULL;
+
+ ptr = response->source;
bs = wolfSSL_d2i_OCSP_RESPONSE(NULL, &ptr, response->maxIdx);
return bs;
}
@@ -1637,8 +1662,8 @@ int wolfSSL_OCSP_single_get0_status(WOLFSSL_OCSP_SINGLERESP *single,
WOLFSSL_ASN1_TIME **thisupd,
WOLFSSL_ASN1_TIME **nextupd)
{
- if (single == NULL)
- return WOLFSSL_FAILURE;
+ if (single == NULL || single->status == NULL)
+ return -1;
#ifdef WOLFSSL_OCSP_PARSE_STATUS
if (thisupd != NULL)
@@ -1784,7 +1809,7 @@ int wolfSSL_OCSP_REQ_CTX_add1_header(WOLFSSL_OCSP_REQ_CTX *ctx,
{
WOLFSSL_ENTER("wolfSSL_OCSP_REQ_CTX_add1_header");
- if (name == NULL) {
+ if (ctx == NULL || name == NULL) {
WOLFSSL_MSG("Bad parameter");
return WOLFSSL_FAILURE;
}
diff --git a/src/ssl.c b/src/ssl.c
index 58cd6701c..7d6ca462b 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -11699,13 +11699,19 @@ char* wolfSSL_CIPHER_description(const WOLFSSL_CIPHER* cipher, char* in,
int wolfSSL_OCSP_parse_url(const char* url, char** host, char** port,
char** path, int* ssl)
{
- const char* u = url;
+ const char* u;
const char* upath; /* path in u */
const char* uport; /* port in u */
const char* hostEnd;
WOLFSSL_ENTER("OCSP_parse_url");
+ if (url == NULL || host == NULL || port == NULL || path == NULL ||
+ ssl == NULL) {
+ return WOLFSSL_FAILURE;
+ }
+
+ u = url;
*host = NULL;
*port = NULL;
*path = NULL;
diff --git a/src/x509.c b/src/x509.c
index 46dfd38ed..b92f7d735 100644
--- a/src/x509.c
+++ b/src/x509.c
@@ -1317,7 +1317,9 @@ int wolfSSL_X509_add_ext(WOLFSSL_X509 *x509, WOLFSSL_X509_EXTENSION *ext,
if (ext && ext->value.data) {
if (ext->value.length == sizeof(word16)) {
/* if ext->value is already word16, set directly */
- x509->keyUsage = *(word16*)ext->value.data;
+ word16 ku;
+ XMEMCPY(&ku, ext->value.data, sizeof(word16));
+ x509->keyUsage = ku;
#ifdef BIG_ENDIAN_ORDER
x509->keyUsage = rotlFixed16(x509->keyUsage, 8U);
#endif
@@ -10998,6 +11000,11 @@ WOLFSSL_ASN1_INTEGER* wolfSSL_X509_get_serialNumber(WOLFSSL_X509* x509)
if (x509->serialNumber != NULL)
return x509->serialNumber;
+ if (x509->serialSz < 0) {
+ WOLFSSL_MSG("Invalid serial number size");
+ return NULL;
+ }
+
a = wolfSSL_ASN1_INTEGER_new();
if (a == NULL)
return NULL;
@@ -16120,7 +16127,8 @@ int wolfSSL_X509_set1_notBefore(WOLFSSL_X509* x509, const WOLFSSL_ASN1_TIME *t)
int wolfSSL_X509_set_serialNumber(WOLFSSL_X509* x509, WOLFSSL_ASN1_INTEGER* s)
{
WOLFSSL_ENTER("wolfSSL_X509_set_serialNumber");
- if (x509 == NULL || s == NULL || s->length >= EXTERNAL_SERIAL_SIZE)
+ if (x509 == NULL || s == NULL || s->data == NULL ||
+ s->length >= EXTERNAL_SERIAL_SIZE)
return WOLFSSL_FAILURE;
/* WOLFSSL_ASN1_INTEGER has type | size | data
diff --git a/tests/api.c b/tests/api.c
index 5eca4071a..919b951b3 100644
--- a/tests/api.c
+++ b/tests/api.c
@@ -20274,7 +20274,7 @@ static int test_wolfSSL_OCSP_single_get0_status(void)
ExpectPtrEq(nextDate, &certStatus.nextDateParsed);
ExpectIntEQ(wolfSSL_OCSP_single_get0_status(NULL, NULL, NULL, NULL, NULL),
- CERT_GOOD);
+ -1);
ExpectIntEQ(wolfSSL_OCSP_single_get0_status(&single, NULL, NULL, NULL,
NULL), CERT_GOOD);
#endif
diff --git a/wolfcrypt/src/evp.c b/wolfcrypt/src/evp.c
index 05e406883..996f31f86 100644
--- a/wolfcrypt/src/evp.c
+++ b/wolfcrypt/src/evp.c
@@ -1314,7 +1314,11 @@ int wolfSSL_EVP_CipherFinal(WOLFSSL_EVP_CIPHER_CTX *ctx, unsigned char *out,
#ifndef WOLFSSL_AESGCM_STREAM
if ((ctx->authBuffer && ctx->authBufferLen > 0)
|| (ctx->authBufferLen == 0)) {
- if (ctx->enc)
+ if (ctx->authBufferLen > 0 && out == NULL) {
+ ret = WOLFSSL_FAILURE;
+ *outl = 0;
+ }
+ else if (ctx->enc)
ret = wc_AesGcmEncrypt(&ctx->cipher.aes, out,
ctx->authBuffer, ctx->authBufferLen,
ctx->iv, ctx->ivSz, ctx->authTag, ctx->authTagSz,
@@ -1397,7 +1401,11 @@ int wolfSSL_EVP_CipherFinal(WOLFSSL_EVP_CIPHER_CTX *ctx, unsigned char *out,
case WC_AES_256_CCM_TYPE:
if ((ctx->authBuffer && ctx->authBufferLen > 0)
|| (ctx->authBufferLen == 0)) {
- if (ctx->enc) {
+ if (ctx->authBufferLen > 0 && out == NULL) {
+ ret = WOLFSSL_FAILURE;
+ *outl = 0;
+ }
+ else if (ctx->enc) {
ret = wc_AesCcmEncrypt(&ctx->cipher.aes, out,
ctx->authBuffer, (word32)ctx->authBufferLen,
ctx->iv, (word32)ctx->ivSz, ctx->authTag,
@@ -4309,16 +4317,19 @@ int wolfSSL_EVP_SignFinal(WOLFSSL_EVP_MD_CTX *ctx, unsigned char *sigret,
#ifndef NO_DSA
case WC_EVP_PKEY_DSA: {
int bytes;
- ret = wolfSSL_DSA_do_sign(md, sigret, pkey->dsa);
+ unsigned char tmpSig[DSA_MAX_SIG_SIZE];
+ ret = wolfSSL_DSA_do_sign(md, tmpSig, pkey->dsa);
/* wolfSSL_DSA_do_sign() can return WOLFSSL_FATAL_ERROR */
if (ret != WOLFSSL_SUCCESS)
return ret;
bytes = wolfSSL_BN_num_bytes(pkey->dsa->q);
if (bytes == WC_NO_ERR_TRACE(WOLFSSL_FAILURE) ||
- (int)*siglen < bytes * 2)
+ bytes > DSA_MAX_HALF_SIZE ||
+ bytes * 2 > (int)*siglen)
{
return WOLFSSL_FAILURE;
}
+ XMEMCPY(sigret, tmpSig, bytes * 2);
*siglen = (unsigned int)(bytes * 2);
return WOLFSSL_SUCCESS;
}
@@ -4398,7 +4409,8 @@ int wolfSSL_EVP_VerifyFinal(WOLFSSL_EVP_MD_CTX *ctx,
unsigned char md[WC_MAX_DIGEST_SIZE];
unsigned int mdsize;
- if (ctx == NULL) return WOLFSSL_FAILURE;
+ if (ctx == NULL || pkey == NULL || sig == NULL)
+ return WOLFSSL_FAILURE;
WOLFSSL_ENTER("EVP_VerifyFinal");
ret = wolfSSL_EVP_DigestFinal(ctx, md, &mdsize);
if (ret <= 0)
@@ -4459,6 +4471,9 @@ WOLFSSL_EVP_PKEY* wolfSSL_EVP_PKEY_new_mac_key(int type, WOLFSSL_ENGINE* e,
if (type != WC_EVP_PKEY_HMAC || (key == NULL && keylen != 0))
return NULL;
+ if (keylen < 0)
+ return NULL;
+
pkey = wolfSSL_EVP_PKEY_new();
if (pkey != NULL) {
pkey->pkey.ptr = (char*)XMALLOC((size_t)keylen, NULL,
@@ -4870,6 +4885,9 @@ int wolfSSL_EVP_DigestSignFinal(WOLFSSL_EVP_MD_CTX *ctx, unsigned char *sig,
return WOLFSSL_SUCCESS;
}
}
+ else if (ctx->pctx == NULL || ctx->pctx->pkey == NULL) {
+ return WOLFSSL_FAILURE;
+ }
#ifndef NO_RSA
else if (ctx->pctx->pkey->type == WC_EVP_PKEY_RSA) {
if (sig == NULL) {
@@ -5007,6 +5025,8 @@ int wolfSSL_EVP_DigestVerifyFinal(WOLFSSL_EVP_MD_CTX *ctx,
return WOLFSSL_FAILURE;
}
else {
+ if (ctx->pctx == NULL || ctx->pctx->pkey == NULL)
+ return WOLFSSL_FAILURE;
/* Verify the signature with the digest. */
switch (ctx->pctx->pkey->type) {
#if !defined(NO_RSA)
@@ -10232,6 +10252,9 @@ int wolfSSL_EVP_Digest(const unsigned char* in, int inSz, unsigned char* out,
return WOLFSSL_FAILURE;
}
+ if (inSz < 0)
+ return WOLFSSL_FAILURE;
+
err = wolfSSL_EVP_get_hashinfo(evp, &hashType, &hashSz);
if (err != WOLFSSL_SUCCESS)
return err;
@@ -11279,6 +11302,7 @@ int wolfSSL_EVP_MD_type(const WOLFSSL_EVP_MD* type)
enum wc_HashType macType;
WOLFSSL_ENTER("wolfSSL_EVP_DigestFinal");
+
macType = EvpMd2MacType(wolfSSL_EVP_MD_CTX_md(ctx));
switch (macType) {
case WC_HASH_TYPE_MD4:
@@ -11304,16 +11328,18 @@ int wolfSSL_EVP_MD_type(const WOLFSSL_EVP_MD* type)
case WC_HASH_TYPE_SHAKE128:
#if defined(WOLFSSL_SHA3) && defined(WOLFSSL_SHAKE128)
- *s = 16; /* if mixing up XOF with plain digest 128 bit is
- * default for SHAKE128 */
+ if (s != NULL)
+ *s = 16; /* if mixing up XOF with plain digest 128 bit is
+ * default for SHAKE128 */
#else
return WOLFSSL_FAILURE;
#endif
break;
case WC_HASH_TYPE_SHAKE256:
#if defined(WOLFSSL_SHA3) && defined(WOLFSSL_SHAKE256)
- *s = 32; /* if mixing up XOF with plain digest 256 bit is
- * default for SHAKE256 */
+ if (s != NULL)
+ *s = 32; /* if mixing up XOF with plain digest 256 bit is
+ * default for SHAKE256 */
#else
return WOLFSSL_FAILURE;
#endif
@@ -12881,6 +12907,9 @@ int wolfSSL_EVP_EncodeBlock(unsigned char *out, const unsigned char *in,
if (out == NULL || in == NULL)
return WOLFSSL_FATAL_ERROR;
+ if (inLen < 0)
+ return WOLFSSL_FATAL_ERROR;
+
if (Base64_Encode_NoNl(in, (word32)inLen, out, &ret) == 0)
return (int)ret;
else
@@ -12897,6 +12926,9 @@ int wolfSSL_EVP_DecodeBlock(unsigned char *out, const unsigned char *in,
if (out == NULL || in == NULL)
return WOLFSSL_FATAL_ERROR;
+ if (inLen < 0)
+ return WOLFSSL_FATAL_ERROR;
+
if (Base64_Decode(in, (word32)inLen, out, &ret) == 0)
return (int)ret;
else
diff --git a/wolfcrypt/src/pwdbased.c b/wolfcrypt/src/pwdbased.c
index c2ed5c042..4b9502a8c 100644
--- a/wolfcrypt/src/pwdbased.c
+++ b/wolfcrypt/src/pwdbased.c
@@ -76,6 +76,9 @@ int wc_PBKDF1_ex(byte* key, int keyLen, byte* iv, int ivLen,
return BAD_FUNC_ARG;
}
+ if (keyLen > INT_MAX - ivLen)
+ return BAD_FUNC_ARG;
+
if (iterations <= 0)
iterations = 1;
@@ -0,0 +1,126 @@
From 1260ee5fe45c6e4c0aeb62c26a04db5faec6ff08 Mon Sep 17 00:00:00 2001
From: Reda Chouk <reda@wolfssl.com>
Date: Fri, 29 May 2026 05:10:21 -0700
Subject: [PATCH] Require equal serial lengths before comparing serial bytes so
a response serial that is only a prefix of the requested serial is not
treated as a match
(cherry picked from commit 53e1db478b62f40ad6ce9b1a1d65d593a9d3d9fb)
CVE: CVE-2026-10098
Upstream-Status: Backport [https://github.com/wolfSSL/wolfssl/commit/53e1db478b62f40ad6ce9b1a1d65d593a9d3d9fb]
Signed-off-by: Ankur Tyagi <ankur.tyagi85@gmail.com>
---
src/ocsp.c | 3 ++-
tests/api.c | 1 +
tests/api/test_ocsp.c | 57 +++++++++++++++++++++++++++++++++++++++++++
tests/api/test_ocsp.h | 1 +
4 files changed, 61 insertions(+), 1 deletion(-)
diff --git a/src/ocsp.c b/src/ocsp.c
index 9de23cb9e..b8352ee72 100644
--- a/src/ocsp.c
+++ b/src/ocsp.c
@@ -750,7 +750,8 @@ int wolfSSL_OCSP_resp_find_status(WOLFSSL_OCSP_BASICRESP *bs,
single = bs->single;
while (single != NULL) {
if (single->status != NULL && id->status != NULL &&
- (XMEMCMP(single->status->serial, id->status->serial,
+ (single->status->serialSz == id->status->serialSz)
+ && (XMEMCMP(single->status->serial, id->status->serial,
(size_t)single->status->serialSz) == 0)
&& (XMEMCMP(single->issuerHash, id->issuerHash, OCSP_DIGEST_SIZE) == 0)
&& (XMEMCMP(single->issuerKeyHash, id->issuerKeyHash, OCSP_DIGEST_SIZE) == 0)) {
diff --git a/tests/api.c b/tests/api.c
index 919b951b3..ad5f84573 100644
--- a/tests/api.c
+++ b/tests/api.c
@@ -35924,6 +35924,7 @@ TEST_CASE testCases[] = {
TEST_DECL(test_ocsp_response_parsing),
TEST_DECL(test_ocsp_certid_enc_dec),
TEST_DECL(test_ocsp_certid_dup),
+ TEST_DECL(test_ocsp_resp_find_status_serial_prefix),
TEST_DECL(test_ocsp_tls_cert_cb),
TEST_DECL(test_ocsp_cert_unknown_crl_fallback),
TEST_DECL(test_ocsp_cert_unknown_crl_fallback_nonleaf),
diff --git a/tests/api/test_ocsp.c b/tests/api/test_ocsp.c
index 02938adfd..1f1055fc6 100644
--- a/tests/api/test_ocsp.c
+++ b/tests/api/test_ocsp.c
@@ -723,6 +723,63 @@ int test_ocsp_certid_dup(void)
}
#endif
+int test_ocsp_resp_find_status_serial_prefix(void)
+{
+ EXPECT_DECLS;
+#if defined(HAVE_OCSP) && defined(OPENSSL_EXTRA) && !defined(NO_SHA)
+ OcspResponse response;
+ OcspEntry single;
+ CertStatus responseStatus;
+ OcspEntry requestedId;
+ CertStatus requestedStatus;
+ int status;
+
+ XMEMSET(&response, 0, sizeof(response));
+ XMEMSET(&single, 0, sizeof(single));
+ XMEMSET(&responseStatus, 0, sizeof(responseStatus));
+ XMEMSET(&requestedId, 0, sizeof(requestedId));
+ XMEMSET(&requestedStatus, 0, sizeof(requestedStatus));
+
+ single.status = &responseStatus;
+ requestedId.status = &requestedStatus;
+ response.single = &single;
+
+ /* Matching issuer name and key hashes on both sides. */
+ XMEMSET(single.issuerHash, 0x41, OCSP_DIGEST_SIZE);
+ XMEMSET(single.issuerKeyHash, 0x42, OCSP_DIGEST_SIZE);
+ XMEMCPY(requestedId.issuerHash, single.issuerHash, OCSP_DIGEST_SIZE);
+ XMEMCPY(requestedId.issuerKeyHash, single.issuerKeyHash, OCSP_DIGEST_SIZE);
+
+ /* Response carries a CERT_GOOD status for serial 01:02 (2 bytes). */
+ responseStatus.serial[0] = 0x01;
+ responseStatus.serial[1] = 0x02;
+ responseStatus.serialSz = 2;
+ responseStatus.status = CERT_GOOD;
+
+ /* Sanity check: an exact serial match must be found and report CERT_GOOD. */
+ requestedStatus.serial[0] = 0x01;
+ requestedStatus.serial[1] = 0x02;
+ requestedStatus.serialSz = 2;
+ status = -1;
+ ExpectIntEQ(wolfSSL_OCSP_resp_find_status(&response, &requestedId, &status,
+ NULL, NULL, NULL, NULL), WOLFSSL_SUCCESS);
+ ExpectIntEQ(status, CERT_GOOD);
+
+ /* Request serial 01:02:03 (3 bytes) shares the 01:02 prefix of the
+ * response serial.
+ * The lookup must not bind the good response to this longer and
+ * differing serial. */
+ requestedStatus.serial[0] = 0x01;
+ requestedStatus.serial[1] = 0x02;
+ requestedStatus.serial[2] = 0x03;
+ requestedStatus.serialSz = 3;
+ status = -1;
+ ExpectIntEQ(wolfSSL_OCSP_resp_find_status(&response, &requestedId, &status,
+ NULL, NULL, NULL, NULL), WOLFSSL_FAILURE);
+#endif
+ return EXPECT_RESULT();
+}
+
#if defined(HAVE_OCSP) && defined(WOLFSSL_CERT_SETUP_CB) && \
defined(HAVE_SSL_MEMIO_TESTS_DEPENDENCIES) && !defined(NO_RSA) && \
(defined(HAVE_CERTIFICATE_STATUS_REQUEST) || \
diff --git a/tests/api/test_ocsp.h b/tests/api/test_ocsp.h
index 6df114b87..2ad56ce55 100644
--- a/tests/api/test_ocsp.h
+++ b/tests/api/test_ocsp.h
@@ -24,6 +24,7 @@
int test_ocsp_certid_enc_dec(void);
int test_ocsp_certid_dup(void);
+int test_ocsp_resp_find_status_serial_prefix(void);
int test_ocsp_status_callback(void);
int test_ocsp_basic_verify(void);
int test_ocsp_response_parsing(void);
@@ -15,6 +15,8 @@ RPROVIDES:${PN} = "cyassl"
SRC_URI = " \
git://github.com/wolfSSL/wolfssl.git;protocol=https;branch=master;tag=v${PV}-stable \
file://run-ptest \
file://CVE-2026-10098-1.patch \
file://CVE-2026-10098-2.patch \
"
SRCREV = "1d363f3adceba9d1478230ede476a37b0dcdef24"