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h264: check for integer overflow, fix null pointer dereference

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Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-12-02 20:36:32 +01:00
parent 2cb227f6a2
commit 936eaa89be
1 changed files with 2 additions and 0 deletions
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2
libavcodec/h264.c
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@ -4010,6 +4010,8 @@ again:
"SPS decoding failure, trying again with the complete NAL\n");
if (h->is_avc)
av_assert0(next_avc - buf_index + consumed == nalsize);
if ((next_avc - buf_index + consumed - 1) >= INT_MAX/8)
break;
init_get_bits(&s->gb, &buf[buf_index + 1 - consumed],
8*(next_avc - buf_index + consumed - 1));
ff_h264_decode_seq_parameter_set(h);