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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2025-01-24 13:56:33 +02:00

5 Commits

Author SHA1 Message Date
Michael Niedermayer
aee0f320ac
avcodec/dts2pts_bsf: Avoid poc overflows in cmp_find()
Fixes: signed integer overflow: -2147483648 - 5 cannot be represented in type 'int'
Fixes: 54242/clusterfuzz-testcase-minimized-ffmpeg_BSF_DTS2PTS_fuzzer-472928339243827

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2022-12-28 00:25:35 +01:00
Michael Niedermayer
125e01d6cc
avcodec/dts2pts_bsf: Avoid searching for poc == INT_MIN-1
Fixes: signed integer overflow: -2147483648 - 1 cannot be represented in type 'int'
Fixes: 53876/clusterfuzz-testcase-minimized-ffmpeg_BSF_DTS2PTS_fuzzer-6569754750222336

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2022-12-25 19:33:24 +01:00
Michael Niedermayer
5185d5656b
avcodec/dts2pts_bsf: Eliminate some 64bit corner cases
Fixes: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
Fixes: 53364/clusterfuzz-testcase-minimized-ffmpeg_BSF_DTS2PTS_fuzzer-4693772269387776

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2022-11-28 20:58:06 +01:00
Michael Niedermayer
024c5b4ab4
avcodec/dts2pts_bsf: Check ctx for NULL before ff_cbs_flush()
Fixes: null pointer dereference
Fixes: 52155/clusterfuzz-testcase-minimized-ffmpeg_BSF_DTS2PTS_fuzzer-5760107527143424

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2022-11-10 21:14:22 +01:00
James Almer
b92e14147f avcodec: add a bsf to reorder DTS into PTS
Starting with an h264 implementation. Can be extended to support other codecs.

A few caveats:
- OpenGOP streams are currently not supported. The firt packet must be an IDR
  frame.
- In some streams, a few frames at the end may not get a reordered PTS when
  they reference frames past EOS. The code added to derive timestamps from
  previous frames needs to extended.

Addresses ticket #502.

Signed-off-by: James Almer <jamrial@gmail.com>
2022-10-04 08:40:16 -03:00