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| author | Ronald S. Bultje <rsbultje@gmail.com> | 2016-01-16 14:44:28 -0500 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2016-10-05 03:06:45 +0200 |
| commit | 62b2b2195b7eac8570ef31b8306916a1a53a537b (patch) | |
| tree | 6bc21d59b5b41b89cb7d7350676b8447fcdda7dd | |
| parent | 239f75d6c3dfbe4def80a12913d5737dd5a5bbcc (diff) | |
| download | ffmpeg-62b2b2195b7eac8570ef31b8306916a1a53a537b.tar.gz | |
videodsp: fix 1-byte overread in top/bottom READ_NUM_BYTES iterations.
This can overread (either before start or beyond end) of the buffer in
Nx1 (i.e. height=1) images.
Fixes mozilla bug 1240080.
(cherry picked from commit 0f88b3f82fafd536979993aeaafcb11a22266dbd)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/x86/videodsp.asm | 21 |
1 files changed, 6 insertions, 15 deletions
diff --git a/libavcodec/x86/videodsp.asm b/libavcodec/x86/videodsp.asm index 48f5ac0ce6..a807d3b888 100644 --- a/libavcodec/x86/videodsp.asm +++ b/libavcodec/x86/videodsp.asm @@ -193,14 +193,10 @@ hvar_fn mov valb, [srcq+%2-1] %elif (%2-%%off) == 2 mov valw, [srcq+%2-2] -%elifidn %1, body +%else mov valb, [srcq+%2-1] - sal vald, 16 + ror vald, 16 mov valw, [srcq+%2-3] -%elifidn %1, bottom - movd mm %+ %%mmx_idx, [srcq+%2-4] -%else ; top - movd mm %+ %%mmx_idx, [srcq+%2-3] %endif %endif ; (%2-%%off) >= 1 %endmacro ; READ_NUM_BYTES @@ -253,18 +249,13 @@ hvar_fn mov [dstq+%2-1], valb %elif (%2-%%off) == 2 mov [dstq+%2-2], valw -%elifidn %1, body - mov [dstq+%2-3], valw - sar vald, 16 - mov [dstq+%2-1], valb %else - movd vald, mm %+ %%mmx_idx -%ifidn %1, bottom - sar vald, 8 -%endif mov [dstq+%2-3], valw - sar vald, 16 + ror vald, 16 mov [dstq+%2-1], valb +%ifnidn %1, body + ror vald, 16 +%endif %endif %endif ; (%2-%%off) >= 1 %endmacro ; WRITE_NUM_BYTES |