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avcodec/dvdsubdec: error on bitmaps with size 0

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Attemtping to decode them could lead to invalid writes with some fuzzed
samples.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit bcaa9099b3648b47060e1724a97dc98b63c83702)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
wm4 2015-01-07 23:57:50 +01:00 committed by Michael Niedermayer
parent b3242c0f22
commit 00cde0cddc
1 changed files with 3 additions and 0 deletions
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3
libavcodec/dvdsubdec.c
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@ -97,6 +97,9 @@ static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
if (start >= buf_size)
return -1;
if (w <= 0 || h <= 0)
return -1;
bit_len = (buf_size - start) * 8;
init_get_bits(&gb, buf + start, bit_len);