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| author | Michael Niedermayer <michaelni@gmx.at> | 2014-10-03 17:35:58 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-10-03 18:35:38 +0200 |
| commit | 12c8e4021c2db6c714bc0d419820c274f19333fc (patch) | |
| tree | a06a34a100d46cd2c31e0ce766f3bce48264bcdf | |
| parent | f56095c4d7e5a76be8b114bcf427ab0becf0c635 (diff) | |
| download | ffmpeg-12c8e4021c2db6c714bc0d419820c274f19333fc.tar.gz | |
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@gmx.at>
(cherry picked from commit 3e2b745020c2dbf0201fe7df3dad9e7e0b2e1bb6)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavcodec/pngdec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 36db29e53e..5b02a4d28a 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) { |