This is a note to let you know that I've just added the patch titled
lib/checksum.c: fix carry in csum_tcpudp_nofold
to the 3.14-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:
lib-checksum.c-fix-carry-in-csum_tcpudp_nofold.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 150ae0e94634714b23919f0c333fee28a5b199d5 Mon Sep 17 00:00:00 2001
From: karl beldan <[email protected]>
Date: Wed, 28 Jan 2015 10:58:11 +0100
Subject: lib/checksum.c: fix carry in csum_tcpudp_nofold
From: karl beldan <[email protected]>
commit 150ae0e94634714b23919f0c333fee28a5b199d5 upstream.
The carry from the 64->32bits folding was dropped, e.g with:
saddr=0xFFFFFFFF daddr=0xFF0000FF len=0xFFFF proto=0 sum=1,
csum_tcpudp_nofold returned 0 instead of 1.
Signed-off-by: Karl Beldan <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Mike Frysinger <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
lib/checksum.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
--- a/lib/checksum.c
+++ b/lib/checksum.c
@@ -47,6 +47,15 @@ static inline unsigned short from32to16(
return x;
}
+static inline u32 from64to32(u64 x)
+{
+ /* add up 32-bit and 32-bit for 32+c bit */
+ x = (x & 0xffffffff) + (x >> 32);
+ /* add up carry.. */
+ x = (x & 0xffffffff) + (x >> 32);
+ return (u32)x;
+}
+
static unsigned int do_csum(const unsigned char *buff, int len)
{
int odd;
@@ -195,8 +204,7 @@ __wsum csum_tcpudp_nofold(__be32 saddr,
#else
s += (proto + len) << 8;
#endif
- s += (s >> 32);
- return (__force __wsum)s;
+ return (__force __wsum)from64to32(s);
}
EXPORT_SYMBOL(csum_tcpudp_nofold);
#endif
Patches currently in stable-queue which might be from [email protected] are
queue-3.14/lib-checksum.c-fix-carry-in-csum_tcpudp_nofold.patch
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