libpng16: CVE-2015-0973

Fixes CVE-2015-0973 (duplicate of CVE-2014-9495), a heap-based overflow
vulnerability in the png_combine_row() function of the libpng library,
when very large interlaced images were used.

Upstream patch:
http://sourceforge.net/p/libpng/code/ci/dc294204b641373bc6eb603075a8b98f51a75dd8/

External Reference:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-0973
http://seclists.org/oss-sec/2014/q4/1133

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>

2 files changed, 48 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/libpng/libpng/libpng16-CVE-2015-0973.patch b/meta/recipes-multimedia/libpng/libpng/libpng16-CVE-2015-0973.patch
new file mode 100644
index 0000000000..d66ac0c9ca
--- /dev/null
+++ b/meta/recipes-multimedia/libpng/libpng/libpng16-CVE-2015-0973.patch
@@ -0,0 +1,47 @@
+libpng16: Fixed an overflow in png_combine_row with very wide interlaced
+
+Fixes CVE-2015-0973 (duplicate of CVE-2014-9495), a heap-based overflow 
+vulnerability in the png_combine_row() function of the libpng library, 
+when very large interlaced images were used. 
+
+Upstream patch:
+http://sourceforge.net/p/libpng/code/ci/dc294204b641373bc6eb603075a8b98f51a75dd8/
+
+Upstream-Status: Backport
+
+Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
+---
+diff --git a/pngrutil.c b/pngrutil.c
+index e9fdd62..4c26be4 100644
+--- a/pngrutil.c
++++ b/pngrutil.c
+@@ -3003,7 +3003,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
+ {
+    unsigned int pixel_depth = png_ptr->transformed_pixel_depth;
+    png_const_bytep sp = png_ptr->row_buf + 1;
+-   png_uint_32 row_width = png_ptr->width;
++   png_alloc_size_t row_width = png_ptr->width;
+    unsigned int pass = png_ptr->pass;
+    png_bytep end_ptr = 0;
+    png_byte end_byte = 0;
+@@ -3278,7 +3278,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
+ 
+             /* But don't allow this number to exceed the actual row width. */
+             if (bytes_to_copy > row_width)
+-               bytes_to_copy = row_width;
++               bytes_to_copy = (unsigned int)/*SAFE*/row_width;
+          }
+ 
+          else /* normal row; Adam7 only ever gives us one pixel to copy. */
+@@ -3458,7 +3458,7 @@ png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display)
+                   dp += bytes_to_jump;
+                   row_width -= bytes_to_jump;
+                   if (bytes_to_copy > row_width)
+-                     bytes_to_copy = row_width;
++                     bytes_to_copy = (unsigned int)/*SAFE*/row_width;
+                }
+          }
+ 
+-- 
+1.9.1
+
diff --git a/meta/recipes-multimedia/libpng/libpng_1.6.8.bb b/meta/recipes-multimedia/libpng/libpng_1.6.8.bb
index d063495f05..bb7745b47c 100644
--- a/meta/recipes-multimedia/libpng/libpng_1.6.8.bb
+++ b/meta/recipes-multimedia/libpng/libpng_1.6.8.bb
@@ -10,6 +10,7 @@ LIBV = "16"
 
 SRC_URI = "${SOURCEFORGE_MIRROR}/project/libpng/libpng${LIBV}/${PV}/libpng-${PV}.tar.xz \
            file://0001-configure-lower-automake-requirement.patch \
+           file://libpng16-CVE-2015-0973.patch \
           "
 
 SRC_URI[md5sum] = "51ce71a1642cdde1f4485a7ff82193c0"