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avcodec/h264_slice: Fix overflow in slice offset

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Fixes: runtime error: signed integer overflow: 1610612736 * 2 cannot be represented in type 'int'
Fixes: 2817/clusterfuzz-testcase-minimized-5289691240726528

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 1f53bde6d817ae13a47748f321adbdfa79e15982)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-08-04 02:41:05 +02:00
parent f0f45d8404
commit f236601e29
1 changed files with 9 additions and 7 deletions
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16
libavcodec/h264_slice.c
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@ -1835,17 +1835,19 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
sl->deblocking_filter ^= 1; // 1<->0
if (sl->deblocking_filter) {
sl->slice_alpha_c0_offset = get_se_golomb(&sl->gb) * 2;
sl->slice_beta_offset = get_se_golomb(&sl->gb) * 2;
if (sl->slice_alpha_c0_offset > 12 ||
sl->slice_alpha_c0_offset < -12 ||
sl->slice_beta_offset > 12 ||
sl->slice_beta_offset < -12) {
int slice_alpha_c0_offset_div2 = get_se_golomb(&sl->gb);
int slice_beta_offset_div2 = get_se_golomb(&sl->gb);
if (slice_alpha_c0_offset_div2 > 6 ||
slice_alpha_c0_offset_div2 < -6 ||
slice_beta_offset_div2 > 6 ||
slice_beta_offset_div2 < -6) {
av_log(h->avctx, AV_LOG_ERROR,
"deblocking filter parameters %d %d out of range\n",
sl->slice_alpha_c0_offset, sl->slice_beta_offset);
slice_alpha_c0_offset_div2, slice_beta_offset_div2);
return AVERROR_INVALIDDATA;
}
sl->slice_alpha_c0_offset = slice_alpha_c0_offset_div2 * 2;
sl->slice_beta_offset = slice_beta_offset_div2 * 2;
}
}