[FFmpeg-cvslog] avcodec/pngdec: Check bits per pixel before setting monoblack pixel format

[Michael Niedermayer]

ffmpeg | branch: release/1.2 | Michael Niedermayer <michaelni at gmx.at> | Fri Oct  3 17:35:58 2014 +0200| [12c8e4021c2db6c714bc0d419820c274f19333fc] | committer: Michael Niedermayer

avcodec/pngdec: Check bits per pixel before setting monoblack pixel format

Fixes out of array accesses
Fixes: asan_heap-oob_14dbfcf_4_asan_heap-oob_1ce5767_179_add_method_small.png

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 3e2b745020c2dbf0201fe7df3dad9e7e0b2e1bb6)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=12c8e4021c2db6c714bc0d419820c274f19333fc
---

 libavcodec/pngdec.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index 36db29e..5b02a4d 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -631,7 +631,7 @@ static int decode_frame(AVCodecContext *avctx,
                 } else if ((s->bits_per_pixel == 1 || s->bits_per_pixel == 2 || s->bits_per_pixel == 4 || s->bits_per_pixel == 8) &&
                            s->color_type == PNG_COLOR_TYPE_PALETTE) {
                     avctx->pix_fmt = AV_PIX_FMT_PAL8;
-                } else if (s->bit_depth == 1) {
+                } else if (s->bit_depth == 1 && s->bits_per_pixel == 1) {
                     avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
                 } else if (s->bit_depth == 8 &&
                            s->color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {