libpng: CVE-2015-8126

Fixes buffer overflow vulnerabilities in png_get_PLTE/png_set_PLTE functions

References:
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2015-8126
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8126

Upstream patches:
https://github.com/glennrp/libpng/commit/81f44665cce4cb1373f049a76f3904e981b7a766
https://github.com/glennrp/libpng/commit/a901eb3ce6087e0afeef988247f1a1aa208cb54d
https://github.com/glennrp/libpng/commit/1bef8e97995c33123665582e57d3ed40b57d5978
https://github.com/glennrp/libpng/commit/83f4c735c88e7f451541c1528d8043c31ba3b466

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

1 files changed, 48 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/libpng/libpng-1.6.13/CVE-2015-8126_4.patch b/meta/recipes-multimedia/libpng/libpng-1.6.13/CVE-2015-8126_4.patch
new file mode 100644
index 0000000000..2622630d10
--- /dev/null
+++ b/meta/recipes-multimedia/libpng/libpng-1.6.13/CVE-2015-8126_4.patch
@@ -0,0 +1,48 @@
+From 83f4c735c88e7f451541c1528d8043c31ba3b466 Mon Sep 17 00:00:00 2001
+From: Glenn Randers-Pehrson <glennrp at users.sourceforge.net>
+Date: Thu, 5 Nov 2015 11:18:44 -0600
+Subject: [PATCH] [libpng16] Clean up coding style in png_handle_PLTE()
+
+Upstream-Status: Backport
+https://github.com/glennrp/libpng/commit/83f4c735c88e7f451541c1528d8043c31ba3b466
+
+CVE:  CVE-2015-8126 patch #4
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ pngrutil.c | 17 ++++++++++-------
+ 1 file changed, 10 insertions(+), 7 deletions(-)
+
+Index: libpng-1.6.17/pngrutil.c
+===================================================================
+--- libpng-1.6.17.orig/pngrutil.c
++++ libpng-1.6.17/pngrutil.c
+@@ -925,18 +925,21 @@ png_handle_PLTE(png_structrp png_ptr, pn
+       return;
+    }
+ 
+-   max_palette_length = (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ?
+-      (1 << png_ptr->bit_depth) : PNG_MAX_PALETTE_LENGTH;
+-
+    /* The cast is safe because 'length' is less than 3*PNG_MAX_PALETTE_LENGTH */
+    num = (int)length / 3;
+ 
+-   /* If the palette has 256 or fewer entries but is too large for the bit depth,
+-    * we don't issue an error, to preserve the behavior of previous libpng versions.
+-    * We silently truncate the unused extra palette entries here.
++   /* If the palette has 256 or fewer entries but is too large for the bit
++    * depth, we don't issue an error, to preserve the behavior of previous
++    * libpng versions. We silently truncate the unused extra palette entries
++    * here.
+     */
++   if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
++      max_palette_length = (1 << png_ptr->bit_depth);
++   else
++      max_palette_length = PNG_MAX_PALETTE_LENGTH;
++
+    if (num > max_palette_length)
+-     num = max_palette_length;
++      num = max_palette_length;
+ 
+ #ifdef PNG_POINTER_INDEXING_SUPPORTED
+    for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)