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avcodec/jpeg2000dwt: Check ndeclevels before calling dwt_decode*()
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>
(cherry picked from commit 75422280fb
)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -555,6 +555,9 @@ int ff_dwt_encode(DWTContext *s, void *t)
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int ff_dwt_decode(DWTContext *s, void *t)
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{
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if (s->ndeclevels == 0)
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return 0;
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switch (s->type) {
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case FF_DWT97:
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dwt_decode97_float(s, t);
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