diff options
author | Michael Niedermayer <michael@niedermayer.cc> | 2021-08-01 20:25:20 +0200 |
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committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-08-06 21:04:43 +0200 |
commit | 2bbef69b0ba938cce4f9d61bed46d3f3058e56c2 (patch) | |
tree | 38de048c75f1ed7f0c07d8a7b2f767703a4de098 /libavformat/mpc8.c | |
parent | 9bc32d7c4bed836086199ce55cf4a5ddd5217f3e (diff) |
avformat/mpc8: Check first keyframe position for overflow
Fixes: signed integer overflow: 9223372036854775791 + 18 cannot be represented in type 'long'
Fixes: 36307/clusterfuzz-testcase-minimized-ffmpeg_dem_MPC8_fuzzer-4917863877050368
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavformat/mpc8.c')
-rw-r--r-- | libavformat/mpc8.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c index df5d345f85..a0e661c2ab 100644 --- a/libavformat/mpc8.c +++ b/libavformat/mpc8.c @@ -177,7 +177,13 @@ static void mpc8_parse_seektable(AVFormatContext *s, int64_t off) } seekd = get_bits(&gb, 4); for(i = 0; i < 2; i++){ - pos = gb_get_v(&gb) + c->header_pos; + pos = gb_get_v(&gb); + if (av_sat_add64(pos, c->header_pos) != pos + (uint64_t)c->header_pos) { + av_free(buf); + return; + } + + pos += c->header_pos; ppos[1 - i] = pos; av_add_index_entry(s->streams[0], pos, i, 0, 0, AVINDEX_KEYFRAME); } |