avcodec/h264_parser: Fix undefined left shift
authorAndreas Rheinhardt <andreas.rheinhardt@outlook.com>
Tue, 26 May 2020 18:26:28 +0000 (20:26 +0200)
committerAndreas Rheinhardt <andreas.rheinhardt@outlook.com>
Fri, 20 Aug 2021 10:19:12 +0000 (12:19 +0200)
commitc83a7dd25fdf9636e7e5da3fad5e0d82035b9c86
tree6325e1d4b9b9c742d2e5bd3721c9a0fd6b80ac7c
parent29bf3fafa0c46b6fbb205bc878fd3bcb6aa0d8cb
avcodec/h264_parser: Fix undefined left shift

Use an uint32_t for the NAL unit size of an AVC H.264 NAL unit instead
of an int as a left shift of a signed value is undefined behaviour
if the result doesn't fit into the target type.

Also make the log message never output negative lengths.

Fixes: left shift of 16711968 by 8 places cannot be represented in type 'int'
Fixes: 36601/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-6581933285965824

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
libavcodec/h264_parser.c