* [FFmpeg-devel] [PATCH] avcodec/qpeldsp: copy less for the mc0x cases
@ 2022-06-26 13:51 Michael Niedermayer
2022-06-27 5:57 ` Andreas Rheinhardt
0 siblings, 1 reply; 4+ messages in thread
From: Michael Niedermayer @ 2022-06-26 13:51 UTC (permalink / raw)
To: FFmpeg development discussions and patches
Fixes: out of array access
Fixes: 47936/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5745039940124672
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/qpeldsp.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/libavcodec/qpeldsp.c b/libavcodec/qpeldsp.c
index 2b9146ceb1..5f937f9d9e 100644
--- a/libavcodec/qpeldsp.c
+++ b/libavcodec/qpeldsp.c
@@ -199,7 +199,7 @@ static void OPNAME ## qpel8_mc01_c(uint8_t *dst, const uint8_t *src, \
uint8_t full[16 * 9]; \
uint8_t half[64]; \
\
- copy_block9(full, src, 16, stride, 9); \
+ copy_block8(full, src, 16, stride, 9); \
put ## RND ## mpeg4_qpel8_v_lowpass(half, full, 8, 16); \
OPNAME ## pixels8_l2_8(dst, full, half, stride, 16, 8, 8); \
} \
@@ -209,7 +209,7 @@ static void OPNAME ## qpel8_mc02_c(uint8_t *dst, const uint8_t *src, \
{ \
uint8_t full[16 * 9]; \
\
- copy_block9(full, src, 16, stride, 9); \
+ copy_block8(full, src, 16, stride, 9); \
OPNAME ## mpeg4_qpel8_v_lowpass(dst, full, stride, 16); \
} \
\
@@ -219,7 +219,7 @@ static void OPNAME ## qpel8_mc03_c(uint8_t *dst, const uint8_t *src, \
uint8_t full[16 * 9]; \
uint8_t half[64]; \
\
- copy_block9(full, src, 16, stride, 9); \
+ copy_block8(full, src, 16, stride, 9); \
put ## RND ## mpeg4_qpel8_v_lowpass(half, full, 8, 16); \
OPNAME ## pixels8_l2_8(dst, full + 16, half, stride, 16, 8, 8); \
} \
@@ -459,7 +459,7 @@ static void OPNAME ## qpel16_mc01_c(uint8_t *dst, const uint8_t *src, \
uint8_t full[24 * 17]; \
uint8_t half[256]; \
\
- copy_block17(full, src, 24, stride, 17); \
+ copy_block16(full, src, 24, stride, 17); \
put ## RND ## mpeg4_qpel16_v_lowpass(half, full, 16, 24); \
OPNAME ## pixels16_l2_8(dst, full, half, stride, 24, 16, 16); \
} \
@@ -469,7 +469,7 @@ static void OPNAME ## qpel16_mc02_c(uint8_t *dst, const uint8_t *src, \
{ \
uint8_t full[24 * 17]; \
\
- copy_block17(full, src, 24, stride, 17); \
+ copy_block16(full, src, 24, stride, 17); \
OPNAME ## mpeg4_qpel16_v_lowpass(dst, full, stride, 24); \
} \
\
@@ -479,7 +479,7 @@ static void OPNAME ## qpel16_mc03_c(uint8_t *dst, const uint8_t *src, \
uint8_t full[24 * 17]; \
uint8_t half[256]; \
\
- copy_block17(full, src, 24, stride, 17); \
+ copy_block16(full, src, 24, stride, 17); \
put ## RND ## mpeg4_qpel16_v_lowpass(half, full, 16, 24); \
OPNAME ## pixels16_l2_8(dst, full + 24, half, stride, 24, 16, 16); \
} \
--
2.17.1
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [FFmpeg-devel] [PATCH] avcodec/qpeldsp: copy less for the mc0x cases
2022-06-26 13:51 [FFmpeg-devel] [PATCH] avcodec/qpeldsp: copy less for the mc0x cases Michael Niedermayer
@ 2022-06-27 5:57 ` Andreas Rheinhardt
2022-06-27 12:40 ` Michael Niedermayer
0 siblings, 1 reply; 4+ messages in thread
From: Andreas Rheinhardt @ 2022-06-27 5:57 UTC (permalink / raw)
To: ffmpeg-devel
Michael Niedermayer:
> Fixes: out of array access
> Fixes: 47936/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5745039940124672
>
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
> libavcodec/qpeldsp.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/libavcodec/qpeldsp.c b/libavcodec/qpeldsp.c
> index 2b9146ceb1..5f937f9d9e 100644
> --- a/libavcodec/qpeldsp.c
> +++ b/libavcodec/qpeldsp.c
> @@ -199,7 +199,7 @@ static void OPNAME ## qpel8_mc01_c(uint8_t *dst, const uint8_t *src, \
> uint8_t full[16 * 9]; \
> uint8_t half[64]; \
> \
> - copy_block9(full, src, 16, stride, 9); \
> + copy_block8(full, src, 16, stride, 9); \
> put ## RND ## mpeg4_qpel8_v_lowpass(half, full, 8, 16); \
> OPNAME ## pixels8_l2_8(dst, full, half, stride, 16, 8, 8); \
> } \
> @@ -209,7 +209,7 @@ static void OPNAME ## qpel8_mc02_c(uint8_t *dst, const uint8_t *src, \
> { \
> uint8_t full[16 * 9]; \
> \
> - copy_block9(full, src, 16, stride, 9); \
> + copy_block8(full, src, 16, stride, 9); \
> OPNAME ## mpeg4_qpel8_v_lowpass(dst, full, stride, 16); \
> } \
> \
> @@ -219,7 +219,7 @@ static void OPNAME ## qpel8_mc03_c(uint8_t *dst, const uint8_t *src, \
> uint8_t full[16 * 9]; \
> uint8_t half[64]; \
> \
> - copy_block9(full, src, 16, stride, 9); \
> + copy_block8(full, src, 16, stride, 9); \
> put ## RND ## mpeg4_qpel8_v_lowpass(half, full, 8, 16); \
> OPNAME ## pixels8_l2_8(dst, full + 16, half, stride, 16, 8, 8); \
> } \
> @@ -459,7 +459,7 @@ static void OPNAME ## qpel16_mc01_c(uint8_t *dst, const uint8_t *src, \
> uint8_t full[24 * 17]; \
> uint8_t half[256]; \
> \
> - copy_block17(full, src, 24, stride, 17); \
> + copy_block16(full, src, 24, stride, 17); \
> put ## RND ## mpeg4_qpel16_v_lowpass(half, full, 16, 24); \
> OPNAME ## pixels16_l2_8(dst, full, half, stride, 24, 16, 16); \
> } \
> @@ -469,7 +469,7 @@ static void OPNAME ## qpel16_mc02_c(uint8_t *dst, const uint8_t *src, \
> { \
> uint8_t full[24 * 17]; \
> \
> - copy_block17(full, src, 24, stride, 17); \
> + copy_block16(full, src, 24, stride, 17); \
> OPNAME ## mpeg4_qpel16_v_lowpass(dst, full, stride, 24); \
> } \
> \
> @@ -479,7 +479,7 @@ static void OPNAME ## qpel16_mc03_c(uint8_t *dst, const uint8_t *src, \
> uint8_t full[24 * 17]; \
> uint8_t half[256]; \
> \
> - copy_block17(full, src, 24, stride, 17); \
> + copy_block16(full, src, 24, stride, 17); \
> put ## RND ## mpeg4_qpel16_v_lowpass(half, full, 16, 24); \
> OPNAME ## pixels16_l2_8(dst, full + 24, half, stride, 24, 16, 16); \
> } \
Are the arch-specific dsp functions affected by this, too?
Do you happen to know why copy_block9/17 has been used in this code?
(After all, using copy_block8/16 should result in a slight speedup, so I
using copy_block9/17 must have been intentional.)
- Andreas
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [FFmpeg-devel] [PATCH] avcodec/qpeldsp: copy less for the mc0x cases
2022-06-27 5:57 ` Andreas Rheinhardt
@ 2022-06-27 12:40 ` Michael Niedermayer
2022-07-12 18:13 ` Michael Niedermayer
0 siblings, 1 reply; 4+ messages in thread
From: Michael Niedermayer @ 2022-06-27 12:40 UTC (permalink / raw)
To: FFmpeg development discussions and patches
[-- Attachment #1.1: Type: text/plain, Size: 6260 bytes --]
On Mon, Jun 27, 2022 at 07:57:06AM +0200, Andreas Rheinhardt wrote:
> Michael Niedermayer:
> > Fixes: out of array access
> > Fixes: 47936/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5745039940124672
> >
> > Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > ---
> > libavcodec/qpeldsp.c | 12 ++++++------
> > 1 file changed, 6 insertions(+), 6 deletions(-)
> >
> > diff --git a/libavcodec/qpeldsp.c b/libavcodec/qpeldsp.c
> > index 2b9146ceb1..5f937f9d9e 100644
> > --- a/libavcodec/qpeldsp.c
> > +++ b/libavcodec/qpeldsp.c
> > @@ -199,7 +199,7 @@ static void OPNAME ## qpel8_mc01_c(uint8_t *dst, const uint8_t *src, \
> > uint8_t full[16 * 9]; \
> > uint8_t half[64]; \
> > \
> > - copy_block9(full, src, 16, stride, 9); \
> > + copy_block8(full, src, 16, stride, 9); \
> > put ## RND ## mpeg4_qpel8_v_lowpass(half, full, 8, 16); \
> > OPNAME ## pixels8_l2_8(dst, full, half, stride, 16, 8, 8); \
> > } \
> > @@ -209,7 +209,7 @@ static void OPNAME ## qpel8_mc02_c(uint8_t *dst, const uint8_t *src, \
> > { \
> > uint8_t full[16 * 9]; \
> > \
> > - copy_block9(full, src, 16, stride, 9); \
> > + copy_block8(full, src, 16, stride, 9); \
> > OPNAME ## mpeg4_qpel8_v_lowpass(dst, full, stride, 16); \
> > } \
> > \
> > @@ -219,7 +219,7 @@ static void OPNAME ## qpel8_mc03_c(uint8_t *dst, const uint8_t *src, \
> > uint8_t full[16 * 9]; \
> > uint8_t half[64]; \
> > \
> > - copy_block9(full, src, 16, stride, 9); \
> > + copy_block8(full, src, 16, stride, 9); \
> > put ## RND ## mpeg4_qpel8_v_lowpass(half, full, 8, 16); \
> > OPNAME ## pixels8_l2_8(dst, full + 16, half, stride, 16, 8, 8); \
> > } \
> > @@ -459,7 +459,7 @@ static void OPNAME ## qpel16_mc01_c(uint8_t *dst, const uint8_t *src, \
> > uint8_t full[24 * 17]; \
> > uint8_t half[256]; \
> > \
> > - copy_block17(full, src, 24, stride, 17); \
> > + copy_block16(full, src, 24, stride, 17); \
> > put ## RND ## mpeg4_qpel16_v_lowpass(half, full, 16, 24); \
> > OPNAME ## pixels16_l2_8(dst, full, half, stride, 24, 16, 16); \
> > } \
> > @@ -469,7 +469,7 @@ static void OPNAME ## qpel16_mc02_c(uint8_t *dst, const uint8_t *src, \
> > { \
> > uint8_t full[24 * 17]; \
> > \
> > - copy_block17(full, src, 24, stride, 17); \
> > + copy_block16(full, src, 24, stride, 17); \
> > OPNAME ## mpeg4_qpel16_v_lowpass(dst, full, stride, 24); \
> > } \
> > \
> > @@ -479,7 +479,7 @@ static void OPNAME ## qpel16_mc03_c(uint8_t *dst, const uint8_t *src, \
> > uint8_t full[24 * 17]; \
> > uint8_t half[256]; \
> > \
> > - copy_block17(full, src, 24, stride, 17); \
> > + copy_block16(full, src, 24, stride, 17); \
> > put ## RND ## mpeg4_qpel16_v_lowpass(half, full, 16, 24); \
> > OPNAME ## pixels16_l2_8(dst, full + 24, half, stride, 24, 16, 16); \
> > } \
>
> Are the arch-specific dsp functions affected by this, too?
the fuzzer sample does not cause a anomaly in the x86 functions
> Do you happen to know why copy_block9/17 has been used in this code?
probably because there was asm anyway so it was unused code or maybe it
was oversight or some sort of code sharing/code cache use reduction but
these hypothesis dont fit entirely. so i dont really know/rememeber
> (After all, using copy_block8/16 should result in a slight speedup, so I
> using copy_block9/17 must have been intentional.)
[...]
--
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Homeopathy is like voting while filling the ballot out with transparent ink.
Sometimes the outcome one wanted occurs. Rarely its worse than filling out
a ballot properly.
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [FFmpeg-devel] [PATCH] avcodec/qpeldsp: copy less for the mc0x cases
2022-06-27 12:40 ` Michael Niedermayer
@ 2022-07-12 18:13 ` Michael Niedermayer
0 siblings, 0 replies; 4+ messages in thread
From: Michael Niedermayer @ 2022-07-12 18:13 UTC (permalink / raw)
To: FFmpeg development discussions and patches
[-- Attachment #1.1: Type: text/plain, Size: 6482 bytes --]
On Mon, Jun 27, 2022 at 02:40:04PM +0200, Michael Niedermayer wrote:
> On Mon, Jun 27, 2022 at 07:57:06AM +0200, Andreas Rheinhardt wrote:
> > Michael Niedermayer:
> > > Fixes: out of array access
> > > Fixes: 47936/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5745039940124672
> > >
> > > Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > > ---
> > > libavcodec/qpeldsp.c | 12 ++++++------
> > > 1 file changed, 6 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/libavcodec/qpeldsp.c b/libavcodec/qpeldsp.c
> > > index 2b9146ceb1..5f937f9d9e 100644
> > > --- a/libavcodec/qpeldsp.c
> > > +++ b/libavcodec/qpeldsp.c
> > > @@ -199,7 +199,7 @@ static void OPNAME ## qpel8_mc01_c(uint8_t *dst, const uint8_t *src, \
> > > uint8_t full[16 * 9]; \
> > > uint8_t half[64]; \
> > > \
> > > - copy_block9(full, src, 16, stride, 9); \
> > > + copy_block8(full, src, 16, stride, 9); \
> > > put ## RND ## mpeg4_qpel8_v_lowpass(half, full, 8, 16); \
> > > OPNAME ## pixels8_l2_8(dst, full, half, stride, 16, 8, 8); \
> > > } \
> > > @@ -209,7 +209,7 @@ static void OPNAME ## qpel8_mc02_c(uint8_t *dst, const uint8_t *src, \
> > > { \
> > > uint8_t full[16 * 9]; \
> > > \
> > > - copy_block9(full, src, 16, stride, 9); \
> > > + copy_block8(full, src, 16, stride, 9); \
> > > OPNAME ## mpeg4_qpel8_v_lowpass(dst, full, stride, 16); \
> > > } \
> > > \
> > > @@ -219,7 +219,7 @@ static void OPNAME ## qpel8_mc03_c(uint8_t *dst, const uint8_t *src, \
> > > uint8_t full[16 * 9]; \
> > > uint8_t half[64]; \
> > > \
> > > - copy_block9(full, src, 16, stride, 9); \
> > > + copy_block8(full, src, 16, stride, 9); \
> > > put ## RND ## mpeg4_qpel8_v_lowpass(half, full, 8, 16); \
> > > OPNAME ## pixels8_l2_8(dst, full + 16, half, stride, 16, 8, 8); \
> > > } \
> > > @@ -459,7 +459,7 @@ static void OPNAME ## qpel16_mc01_c(uint8_t *dst, const uint8_t *src, \
> > > uint8_t full[24 * 17]; \
> > > uint8_t half[256]; \
> > > \
> > > - copy_block17(full, src, 24, stride, 17); \
> > > + copy_block16(full, src, 24, stride, 17); \
> > > put ## RND ## mpeg4_qpel16_v_lowpass(half, full, 16, 24); \
> > > OPNAME ## pixels16_l2_8(dst, full, half, stride, 24, 16, 16); \
> > > } \
> > > @@ -469,7 +469,7 @@ static void OPNAME ## qpel16_mc02_c(uint8_t *dst, const uint8_t *src, \
> > > { \
> > > uint8_t full[24 * 17]; \
> > > \
> > > - copy_block17(full, src, 24, stride, 17); \
> > > + copy_block16(full, src, 24, stride, 17); \
> > > OPNAME ## mpeg4_qpel16_v_lowpass(dst, full, stride, 24); \
> > > } \
> > > \
> > > @@ -479,7 +479,7 @@ static void OPNAME ## qpel16_mc03_c(uint8_t *dst, const uint8_t *src, \
> > > uint8_t full[24 * 17]; \
> > > uint8_t half[256]; \
> > > \
> > > - copy_block17(full, src, 24, stride, 17); \
> > > + copy_block16(full, src, 24, stride, 17); \
> > > put ## RND ## mpeg4_qpel16_v_lowpass(half, full, 16, 24); \
> > > OPNAME ## pixels16_l2_8(dst, full + 24, half, stride, 24, 16, 16); \
> > > } \
> >
> > Are the arch-specific dsp functions affected by this, too?
>
> the fuzzer sample does not cause a anomaly in the x86 functions
>
>
> > Do you happen to know why copy_block9/17 has been used in this code?
>
> probably because there was asm anyway so it was unused code or maybe it
> was oversight or some sort of code sharing/code cache use reduction but
> these hypothesis dont fit entirely. so i dont really know/rememeber
either way dont want to leave this open, so will apply. If more is needed
that will be fixed once we know of it
thx
[...]
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Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Homeopathy is like voting while filling the ballot out with transparent ink.
Sometimes the outcome one wanted occurs. Rarely its worse than filling out
a ballot properly.
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2022-06-26 13:51 [FFmpeg-devel] [PATCH] avcodec/qpeldsp: copy less for the mc0x cases Michael Niedermayer
2022-06-27 5:57 ` Andreas Rheinhardt
2022-06-27 12:40 ` Michael Niedermayer
2022-07-12 18:13 ` Michael Niedermayer
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