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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-08-04 02:41:05 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-08-08 19:37:25 +0200 |
| commit | f236601e29b986a547d68aa3248e06ffbeee1e39 (patch) | |
| tree | 4a13667bb56e6a1fd143b40be00b30226369ee5f | |
| parent | f0f45d84045307eeca5d0ec950ddcea702c68997 (diff) | |
| download | ffmpeg-f236601e29b986a547d68aa3248e06ffbeee1e39.tar.gz | |
avcodec/h264_slice: Fix overflow in slice offset
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>
| -rw-r--r-- | libavcodec/h264_slice.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c index ab9f171921..033dd2ab85 100644 --- a/libavcodec/h264_slice.c +++ b/libavcodec/h264_slice.c @@ -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; } } |