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aacsbr: handle m_max values smaller than 4.

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Prevents a signflip in the counter, and a subsequent crash because of
overreads/overwrites.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Ronald S. Bultje 2012-03-22 11:50:48 -07:00
parent 73ad4471a4
commit 71ea26811c
1 changed files with 1 additions and 0 deletions
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libavcodec/x86/sbrdsp.asm
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@ -81,6 +81,7 @@ cglobal sbr_hf_g_filt, 5, 6, 5
lea r2, [r2 + r3*4]
lea r0, [r0 + r3*8]
neg r3
jz .loop1
.loop4:
movlps m0, [r2 + 4*r3 + 0]
movlps m1, [r2 + 4*r3 + 8]