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

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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>
This commit is contained in:
Michael Niedermayer 2014-10-03 17:35:58 +02:00
parent e1c0cfaa41
commit 3e2b745020
1 changed files with 1 additions and 1 deletions
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2
libavcodec/pngdec.c
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@ -650,7 +650,7 @@ 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) {