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avcodec/gifdec: check that the correct number of bytes was decoded

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Fixes use of uninitialized memory
Fixes: msan_uninit-mem_7f084c646637_9261_top_title_green_frog.gif
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-12-17 02:32:19 +01:00
parent 5fe415f0f4
commit 745c40a47f
1 changed files with 5 additions and 1 deletions
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6
libavcodec/gifdec.c
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@ -237,8 +237,12 @@ static int gif_read_image(GifState *s, AVFrame *frame)
pass = 0;
y1 = 0;
for (y = 0; y < height; y++) {
if (ff_lzw_decode(s->lzw, s->idx_line, width) == 0)
int count = ff_lzw_decode(s->lzw, s->idx_line, width);
if (count != width) {
if (count)
av_log(s->avctx, AV_LOG_ERROR, "LZW decode failed\n");
goto decode_tail;
}
pr = ptr + width;