This is a note to let you know that I've just added the patch titled
parisc: Fix csum_ipv6_magic on 32-bit systems
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
parisc-fix-csum_ipv6_magic-on-32-bit-systems.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a7b8b9bafd54330c4b0e62fd81531609ccd8e9a5
Author: Guenter Roeck <linux@xxxxxxxxxxxx>
Date: Sat Feb 10 11:15:56 2024 -0800
parisc: Fix csum_ipv6_magic on 32-bit systems
[ Upstream commit 4408ba75e4ba80c91fde7e10bccccf388f5c09be ]
Calculating the IPv6 checksum on 32-bit systems missed overflows when
adding the proto+len fields into the checksum. This results in the
following unit test failure.
# test_csum_ipv6_magic: ASSERTION FAILED at lib/checksum_kunit.c:506
Expected ( u64)csum_result == ( u64)expected, but
( u64)csum_result == 46722 (0xb682)
( u64)expected == 46721 (0xb681)
not ok 5 test_csum_ipv6_magic
This is probably rarely seen in the real world because proto+len are
usually small values which will rarely result in overflows when calculating
the checksum. However, the unit test code uses large values for the length
field, causing the test to fail.
Fix the problem by adding the missing carry into the final checksum.
Cc: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Tested-by: Charlie Jenkins <charlie@xxxxxxxxxxxx>
Reviewed-by: Charlie Jenkins <charlie@xxxxxxxxxxxx>
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/parisc/include/asm/checksum.h b/arch/parisc/include/asm/checksum.h
index 7efcd901b9656..0a02639514505 100644
--- a/arch/parisc/include/asm/checksum.h
+++ b/arch/parisc/include/asm/checksum.h
@@ -178,7 +178,8 @@ static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
" ldw,ma 4(%2), %7\n" /* 4th daddr */
" addc %6, %0, %0\n"
" addc %7, %0, %0\n"
-" addc %3, %0, %0\n" /* fold in proto+len, catch carry */
+" addc %3, %0, %0\n" /* fold in proto+len */
+" addc 0, %0, %0\n" /* add carry */
#endif
: "=r" (sum), "=r" (saddr), "=r" (daddr), "=r" (len),
