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avcodec/x86/diracdsp: Fix incorrect src addressing in dequant_subband_32()

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Fixes: Segfault (not reproducable with asm, which made this hard to debug)
Fixes: decoding errors
Fixes: 19854/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5729372837511168

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-01-29 22:11:45 +01:00
parent 20916f9bc4
commit 0694b60b7b
1 changed files with 2 additions and 1 deletions
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3
libavcodec/x86/diracdsp.asm
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@ -294,8 +294,9 @@ cglobal dequant_subband_32, 7, 7, 4, src, dst, stride, qf, qs, tot_v, tot_h
add srcq, mmsize
add dstq, mmsize
sub tot_hd, 4
sub tot_hq, 4
jg .loop_h
lea srcq, [srcq + 4*tot_hq]
add r3, strideq
dec tot_vd