avcodec/vc1_block: Fix invalid shifts in vc1_decode_i_blocks()
authorMichael Niedermayer <michael@niedermayer.cc>
Sat, 22 Jun 2019 12:21:43 +0000 (14:21 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Sun, 11 Aug 2019 17:13:21 +0000 (19:13 +0200)
commitc9415e815a996d287850a3572ce2c1d663b9f657
treed95f9417b025eb181e3d0ad2f2a4a9d6c1d3cfaf
parentb153ba1c2e03d3148766a3ebf0e9c485197f30de
avcodec/vc1_block: Fix invalid shifts in vc1_decode_i_blocks()

Fixes: left shift of negative value -9
Fixes: 15299/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MSS2_fuzzer-5660922678345728
Fixes: 15557/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-5673351911047168

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/vc1_block.c