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| author | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-03 23:42:00 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2018-01-05 03:35:48 +0100 |
| commit | b2be76c0a472b729756ed7a91225c209d0dd1d2e (patch) | |
| tree | 03454f93de4071b26ae65ad46202cfc0ae815bf0 | |
| parent | e425047a47b68dd21d50f0d83cfd7ae816268f57 (diff) | |
| download | ffmpeg-b2be76c0a472b729756ed7a91225c209d0dd1d2e.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>
| -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 05f4458f99..11d0bf424a 100644 --- a/libavcodec/dnxhddec.c +++ b/libavcodec/dnxhddec.c @@ -383,6 +383,10 @@ 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); @@ -436,7 +440,7 @@ 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; } |