curl: Security fix for CVE-2016-8618

Affected versions: curl 7.1 to and including 7.50.3
Not affected versions: curl >= 7.51.0

(From OE-Core rev: 1fc1c9a11eee2f5ba727b18300a92949b166b035)

Signed-off-by: Thiruvadi Rajaraman <trajaraman@mvista.com>
Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/curl/curl/CVE-2016-8618.patch

@@ -0,0 +1,49 @@
+From 31106a073882656a2a5ab56c4ce2847e9a334c3c Mon Sep 17 00:00:00 2001
+From: Daniel Stenberg <daniel@haxx.se>
+Date: Wed, 28 Sep 2016 10:15:34 +0200
+Subject: [PATCH] aprintf: detect wrap-around when growing allocation
+
+On 32bit systems we could otherwise wrap around after 2GB and allocate 0
+bytes and crash.
+
+CVE-2016-8618
+
+Bug: https://curl.haxx.se/docs/adv_20161102D.html
+Reported-by: Cure53
+
+Upstream-Status: Backport
+https://curl.haxx.se/CVE-2016-8618.patch
+CVE: CVE-2016-8618
+Signed-off-by: Thiruvadi Rajaraman <trajaraman@mvista.com>
+
+---
+ lib/mprintf.c | 9 ++++++---
+ 1 file changed, 6 insertions(+), 3 deletions(-)
+
+Index: curl-7.44.0/lib/mprintf.c
+===================================================================
+--- curl-7.44.0.orig/lib/mprintf.c
++++ curl-7.44.0/lib/mprintf.c
+@@ -1011,16 +1011,19 @@ static int alloc_addbyter(int output, FI
+     infop->len =0;
+   }
+   else if(infop->len+1 >= infop->alloc) {
+-    char *newptr;
++    char *newptr = NULL;
++    size_t newsize = infop->alloc*2;
+ 
+-    newptr = realloc(infop->buffer, infop->alloc*2);
++    /* detect wrap-around or other overflow problems */
++    if(newsize > infop->alloc)
++      newptr = realloc(infop->buffer, newsize);
+ 
+     if(!newptr) {
+       infop->fail = 1;
+       return -1; /* fail */
+     }
+     infop->buffer = newptr;
+-    infop->alloc *= 2;
++    infop->alloc = newsize;
+   }
+ 
+   infop->buffer[ infop->len ] = outc;

meta/recipes-support/curl/curl_7.50.1.bb

@@ -14,6 +14,7 @@ SRC_URI = "http://curl.haxx.se/download/curl-${PV}.tar.bz2 \
 #
 SRC_URI += " file://configure_ac.patch \
              file://CVE-2016-8615.patch \
+             file://CVE-2016-8618.patch \
            "
 
 SRC_URI[md5sum] = "015f6a0217ca6f2c5442ca406476920b"