libpng: fix CVE-2019-7317

(From OE-Core rev: 983d4757db7d46dcd4116269c4446392e28f16fb)

(From OE-Core rev: ab4483fbd95fecb951e765ebc7da918b503142ca)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/libpng/libpng/CVE-2019-7317.patch

@@ -0,0 +1,20 @@
+Use-after-free detected with static analysis.
+
+CVE: CVE-2019-7317
+Upstream-Status: Submitted [https://github.com/glennrp/libpng/issues/275]
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+diff --git a/png.c b/png.c
+index 9d9926f638..efd1aecfbd 100644
+--- a/png.c
++++ b/png.c
+@@ -4588,8 +4588,7 @@ png_image_free(png_imagep image)
+    if (image != NULL && image->opaque != NULL &&
+       image->opaque->error_buf == NULL)
+    {
+-      /* Ignore errors here: */
+-      (void)png_safe_execute(image, png_image_free_function, image);
++      png_image_free_function(image);
+       image->opaque = NULL;
+    }
+ }

meta/recipes-multimedia/libpng/libpng_1.6.36.bb

@@ -9,7 +9,8 @@ DEPENDS = "zlib"
 
 LIBV = "16"
 
-SRC_URI = "${SOURCEFORGE_MIRROR}/project/${BPN}/${BPN}${LIBV}/${PV}/${BP}.tar.xz"
+SRC_URI = "${SOURCEFORGE_MIRROR}/project/${BPN}/${BPN}${LIBV}/${PV}/${BP}.tar.xz \
+           file://CVE-2019-7317.patch"
 SRC_URI[md5sum] = "df2be2d29c40937fe1f5349b16bc2826"
 SRC_URI[sha256sum] = "eceb924c1fa6b79172fdfd008d335f0e59172a86a66481e09d4089df872aa319"