Crc crash #108
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Crc crash #108
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Otherwise it might be > buf_ptr in which case ffio_get_checksum() could segfault (s->buf_ptr - s->checksum_ptr would be negative which would be converted to something very big when converted to unsigned for the update_checksum callback). Fixes ticket #11233. Reported-by: Du4t Signed-off-by: Andreas Rheinhardt <[email protected]>
The behavior of the ffio_*_checksum feature is not well defined when using avio_skip(). The code in oggdec.c relied on the skipped data (four bytes) to be checksummed, which is mostly true because short_seek_threshold is 32768 by default, so that avio_seek() will normally read data instead of calling the underlying seek function. Yet this has two problems: a) It relies on implementation details of avio_seek(). b) There is an exception, namely if the AVIO_FLAG_DIRECT is set. In this case the underlying seek function (if set) is always called and the data is skipped, leading to CRC errors. So don't skip the data. Signed-off-by: Andreas Rheinhardt <[email protected]>
Signed-off-by: Andreas Rheinhardt <[email protected]>
This is unlikely to matter for real files. Signed-off-by: Andreas Rheinhardt <[email protected]>
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On the FFmpeg mailing list, Andreas Rheinhardt wrote (reply to this): |
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The main aim of this patchset is to fix ticket 11233.