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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-03 23:42:00 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-08 23:19:15 +0100 |
| commit | c4ead1ab27f4a00dcc7f0e6a2a2794220fd607d5 (patch) | |
| tree | 8fca47746ebe91b2fac6d164b48ffe731b815e7c | |
| parent | 6d654eb036ce44856ca14c176baba8fb1410db32 (diff) | |
| download | ffmpeg-c4ead1ab27f4a00dcc7f0e6a2a2794220fd607d5.tar.gz | |
avcodec/dnxhddec: Check dc vlc
Fixes: signed integer overflow: 1024 + 2147483640 cannot be represented in type 'int'
Fixes: 4671/clusterfuzz-testcase-minimized-6027464343027712
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit b2be76c0a472b729756ed7a91225c209d0dd1d2e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/dnxhddec.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c index 66a0de2e62..3f730aae5b 100644 --- a/libavcodec/dnxhddec.c +++ b/libavcodec/dnxhddec.c @@ -372,6 +372,10 @@ static av_always_inline int dnxhd_decode_dct_block(const DNXHDContext *ctx, UPDATE_CACHE(bs, &row->gb); GET_VLC(len, bs, &row->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1); + if (len < 0) { + ret = len; + goto error; + } if (len) { level = GET_CACHE(bs, &row->gb); LAST_SKIP_BITS(bs, &row->gb, len); @@ -425,7 +429,7 @@ static av_always_inline int dnxhd_decode_dct_block(const DNXHDContext *ctx, GET_VLC(index1, bs, &row->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2); } - +error: CLOSE_READER(bs, &row->gb); return ret; } |