Patch "powerpc/64: Fix checksum folding in csum_tcpudp_nofold and ip_fast_csum_nofold" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    powerpc/64: Fix checksum folding in csum_tcpudp_nofold and ip_fast_csum_nofold

to the 4.9-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:
     powerpc-64-fix-checksum-folding-in-csum_tcpudp_nofold-and-ip_fast_csum_nofold.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From b492f7e4e07a28e706db26cf4943bb0911435426 Mon Sep 17 00:00:00 2001
From: Paul Mackerras <paulus@ozlabs.org>
Date: Thu, 3 Nov 2016 16:10:55 +1100
Subject: powerpc/64: Fix checksum folding in csum_tcpudp_nofold and ip_fast_csum_nofold

From: Paul Mackerras <paulus@ozlabs.org>

commit b492f7e4e07a28e706db26cf4943bb0911435426 upstream.

These functions compute an IP checksum by computing a 64-bit sum and
folding it to 32 bits (the "nofold" in their names refers to folding
down to 16 bits).  However, doing (u32) (s + (s >> 32)) is not
sufficient to fold a 64-bit sum to 32 bits correctly.  The addition
can produce a carry out from bit 31, which needs to be added in to
the sum to produce the correct result.

To fix this, we copy the from64to32() function from lib/checksum.c
and use that.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/include/asm/checksum.h |   17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

--- a/arch/powerpc/include/asm/checksum.h
+++ b/arch/powerpc/include/asm/checksum.h
@@ -53,17 +53,25 @@ static inline __sum16 csum_fold(__wsum s
 	return (__force __sum16)(~((__force u32)sum + tmp) >> 16);
 }
 
+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 inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
 					__u8 proto, __wsum sum)
 {
 #ifdef __powerpc64__
-	unsigned long s = (__force u32)sum;
+	u64 s = (__force u32)sum;
 
 	s += (__force u32)saddr;
 	s += (__force u32)daddr;
 	s += proto + len;
-	s += (s >> 32);
-	return (__force __wsum) s;
+	return (__force __wsum) from64to32(s);
 #else
     __asm__("\n\
 	addc %0,%0,%1 \n\
@@ -123,8 +131,7 @@ static inline __wsum ip_fast_csum_nofold
 
 	for (i = 0; i < ihl - 1; i++, ptr++)
 		s += *ptr;
-	s += (s >> 32);
-	return (__force __wsum)s;
+	return (__force __wsum)from64to32(s);
 #else
 	__wsum sum, tmp;
 


Patches currently in stable-queue which might be from paulus@ozlabs.org are

queue-4.9/powerpc-64-fix-checksum-folding-in-csum_tcpudp_nofold-and-ip_fast_csum_nofold.patch
queue-4.9/powerpc-64-fix-checksum-folding-in-csum_add.patch
queue-4.9/powerpc-64-invalidate-process-table-caching-after-setting-process-table.patch