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avcodec/jpeg2000dwt: Check ndeclevels before calling dwt_decode*()

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Fixes out of array access
Fixes: 01859c9a9ac6cd60a008274123275574/asan_heap-oob_1dff571_8250_50d3d1611e294c3519fd1fa82198b69b.avi

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-11-27 20:52:39 +01:00
parent 8453095f3e
commit 75422280fb
1 changed files with 3 additions and 0 deletions
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libavcodec/jpeg2000dwt.c
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@ -595,6 +595,9 @@ int ff_dwt_encode(DWTContext *s, void *t)
int ff_dwt_decode(DWTContext *s, void *t)
{
if (s->ndeclevels == 0)
return 0;
switch (s->type) {
case FF_DWT97:
dwt_decode97_float(s, t);