avcodec/mpeg4videodec: Fix undefined shift in get_amv()
authorMichael Niedermayer <michael@niedermayer.cc>
Fri, 14 Sep 2018 22:20:38 +0000 (00:20 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Sun, 28 Oct 2018 00:22:42 +0000 (02:22 +0200)
commitf80da843b219d978d8c102a5ade94e032a09f9a2
tree8e2eeb5d251dd11a3f40e38ef9f915e8a96b09fc
parent127ec77e8cc5563c21966ed0dc61be00ee167e71
avcodec/mpeg4videodec: Fix undefined shift in get_amv()

Fixes: runtime error: shift exponent -1 is negative
Fixes: 9938/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5653783529914368

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c88afa44c4823aba7b6f4a1b01fd6a4169643c57)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/mpeg4videodec.c