redis: Fix CVE-2025-21605

Upstream-Status: Backport from https://github.com/redis/redis/commit/42fb340ce426364d64f5dccc9c2549e58f48ac6f

Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-extended/redis/redis-7.0.13/CVE-2025-21605.patch

@@ -0,0 +1,62 @@
+From 42fb340ce426364d64f5dccc9c2549e58f48ac6f Mon Sep 17 00:00:00 2001
+From: YaacovHazan <yaacov.hazan@redis.com>
+Date: Wed, 23 Apr 2025 08:09:40 +0000
+Subject: [PATCH] Limiting output buffer for unauthenticated client
+ (CVE-2025-21605)
+
+For unauthenticated clients the output buffer is limited to prevent
+them from abusing it by not reading the replies
+
+Upstream-Status: Backport [https://github.com/redis/redis/commit/42fb340ce426364d64f5dccc9c2549e58f48ac6f]
+CVE: CVE-2025-21605
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ src/networking.c    |  5 +++++
+ tests/unit/auth.tcl | 18 ++++++++++++++++++
+ 2 files changed, 23 insertions(+)
+
+diff --git a/src/networking.c b/src/networking.c
+index 7007141a867..bb1a72b9fb4 100644
+--- a/src/networking.c
++++ b/src/networking.c
+@@ -3858,6 +3858,11 @@ int checkClientOutputBufferLimits(client *c) {
+     int soft = 0, hard = 0, class;
+     unsigned long used_mem = getClientOutputBufferMemoryUsage(c);
+ 
++    /* For unauthenticated clients the output buffer is limited to prevent
++     * them from abusing it by not reading the replies */
++    if (used_mem > 1024 && authRequired(c))
++        return 1;
++
+     class = getClientType(c);
+     /* For the purpose of output buffer limiting, masters are handled
+      * like normal clients. */
+diff --git a/tests/unit/auth.tcl b/tests/unit/auth.tcl
+index 9532e0bd2eb..0d25f5dea2d 100644
+--- a/tests/unit/auth.tcl
++++ b/tests/unit/auth.tcl
+@@ -45,6 +45,24 @@ start_server {tags {"auth external:skip"} overrides {requirepass foobar}} {
+         assert_match {*unauthenticated bulk length*} $e
+         $rr close
+     }
++
++    test {For unauthenticated clients output buffer is limited} {
++        set rr [redis [srv "host"] [srv "port"] 1 $::tls]
++        $rr SET x 5
++        catch {[$rr read]} e
++        assert_match {*NOAUTH Authentication required*} $e
++
++        # Fill the output buffer in a loop without reading it and make
++        # sure the client disconnected.
++        # Considering the socket eat some of the replies, we are testing
++        # that such client can't consume more than few MB's.
++        catch {
++            for {set j 0} {$j < 1000000} {incr j} {
++                    $rr SET x 5
++            }
++        } e
++        assert_match {I/O error reading reply} $e
++    }
+ }
+ 
+ start_server {tags {"auth_binary_password external:skip"}} {

meta-oe/recipes-extended/redis/redis_7.0.13.bb

@@ -23,6 +23,7 @@ SRC_URI = "http://download.redis.io/releases/${BP}.tar.gz \
            file://CVE-2024-31449.patch \
            file://CVE-2024-46981.patch \
            file://CVE-2024-51741.patch \
+           file://CVE-2025-21605.patch \
            "
 SRC_URI[sha256sum] = "97065774d5fb8388eb0d8913458decfcb167d356e40d31dd01cd30c1cc391673"