This is an automated email from the git hooks/post-receive script.
Git pushed a commit to branch master
in repository ffmpeg.
The following commit(s) were added to refs/heads/master by this push:
new c9e36046a3 libswscale: use unaligned read/write macros in
planarCopyWrapper
c9e36046a3 is described below
commit c9e36046a338638279782cba4fba3299bf65f46b
Author: yongdev <[email protected]>
AuthorDate: Tue Aug 18 23:04:36 2026 +0000
Commit: Niklas Haas <[email protected]>
CommitDate: Mon Aug 31 13:47:25 2026 +0000
libswscale: use unaligned read/write macros in planarCopyWrapper
When performing unscaled planar copies or format conversions on 16-bit
buffers in planarCopyWrapper, srcPtr2 and dstPtr2 are not guaranteed to
be 8-byte aligned (e.g. subsampled chroma planes with non-multiple-of-8
widths/strides or odd slice offsets).
AV_RN64A / AV_WN64A and AV_RN32A / AV_WN32A cast pointers to av_alias64
or av_alias32 which have __attribute__((aligned(8))) or aligned(4).
Dereferencing unaligned pointers with aligned attribute triggers Undefined
Behavior traps (SIGILL / UD1 instruction with Clang -fsanitize=alignment).
Replace them with AV_RN64 / AV_WN64 and AV_RN32 / AV_WN32.
Signed-off-by: yongdev <[email protected]>
---
libswscale/swscale_unscaled.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/libswscale/swscale_unscaled.c b/libswscale/swscale_unscaled.c
index 18fc8fe7d7..7acab95e03 100644
--- a/libswscale/swscale_unscaled.c
+++ b/libswscale/swscale_unscaled.c
@@ -2291,13 +2291,13 @@ static int planarCopyWrapper(SwsInternal *c, const
uint8_t *const src[],
shiftonly) {
#if HAVE_FAST_64BIT
for (; j < length - 3; j += 4) {
- uint64_t v = AV_RN64A(srcPtr2 + j) >>
src_shift;
- AV_WN64A(dstPtr2 + j, (v << shift) <<
dst_shift);
+ uint64_t v = AV_RN64(srcPtr2 + j) >> src_shift;
+ AV_WN64(dstPtr2 + j, (v << shift) <<
dst_shift);
}
#else
for (; j < length - 1; j += 2) {
- uint32_t v = AV_RN32A(srcPtr2 + j) >>
src_shift;
- AV_WN32A(dstPtr2 + j, (v << shift) <<
dst_shift);
+ uint32_t v = AV_RN32(srcPtr2 + j) >> src_shift;
+ AV_WN32(dstPtr2 + j, (v << shift) <<
dst_shift);
}
#endif
}
--
To stop receiving notification emails like this one, please contact
[email protected].
_______________________________________________
ffmpeg-cvslog mailing list -- [email protected]
To unsubscribe send an email to [email protected]
