If the block is at the end of the allocated buffer and there is no
padding, this will over-read, which may cause crashes. Reported by
Firefox.
---
libavcodec/x86/vp9mc.asm | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/x86/vp9mc.asm b/libavcodec/x86/vp9mc.asm
index f64161b2c2..efc4cfbef1 100644
--- a/libavcodec/x86/vp9mc.asm
+++ b/libavcodec/x86/vp9mc.asm
@@ -604,7 +604,12 @@ cglobal vp9_%1%2 %+ %%szsuf, 5, 5, %8, dst, dstride, src,
sstride, h
%%pavg m0, [dstq]
%%pavg m1, [dstq+d%3]
%%pavg m2, [dstq+d%4]
+%if %2 == 4
+ %%srcfn m4, [dstq+d%5]
+ %%pavg m3, m4
+%else
%%pavg m3, [dstq+d%5]
+%endif
%if %2/mmsize == 8
%%pavg m4, [dstq+mmsize*4]
%%pavg m5, [dstq+mmsize*5]
--
2.34.1
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