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authorAndreas Rheinhardt <andreas.rheinhardt@gmail.com>2019-11-17 08:34:36 +0100
committerJames Almer <jamrial@gmail.com>2019-12-31 16:57:37 -0300
commit4667920455c0d52c25835ff81098254213f2d018 (patch)
tree431dbc0a0d8c4ecdf052e06cf25c8a50d03dd809 /libavcodec/dct32_fixed.c
parent1cf238d3bfefdfd3345ca262f57e08a798bb0d90 (diff)
downloadffmpeg-4667920455c0d52c25835ff81098254213f2d018.tar.gz
avcodec/cbs: Fix potential overflow
The number of bits in a PutBitContext must fit into an int, yet nothing guaranteed the size argument cbs_write_unit_data() uses in init_put_bits() to be in the range 0..INT_MAX / 8. This has been changed. Furthermore, the check 8 * data_size > data_bit_start that there is data beyond the initial padding when writing mpeg2 or H.264/5 slices could also overflow, so divide it by 8 to get an equivalent check without this problem. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> (cherry picked from commit cda3e8ca04c0e343f5b60fda8fb467936e176f33)
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