[patch 1/3] s390: fix strnlen_user return value

[Heiko Carstens]

From: Gerald Schaefer <geraldsc@xxxxxxxxxx>

strnlen_user is supposed to return then length count + 1 if no
terminating \0 is found, and it should return 0 on exception.
Found by David Howells <dhowells@xxxxxxxxxx>.

Signed-off-by: Gerald Schaefer <geraldsc@xxxxxxxxxx>
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---

 arch/s390/lib/uaccess.S   |    6 +++---
 arch/s390/lib/uaccess64.S |    6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff -urpN linux-2.6/arch/s390/lib/uaccess64.S linux-2.6-patched/arch/s390/lib/uaccess64.S
--- linux-2.6/arch/s390/lib/uaccess64.S	2006-01-03 04:21:10.000000000 +0100
+++ linux-2.6-patched/arch/s390/lib/uaccess64.S	2006-03-07 07:59:22.000000000 +0100
@@ -194,12 +194,12 @@ __strnlen_user_asm:
 0:	srst	%r2,%r1
 	jo	0b
 	sacf	0
-	jh	1f		# \0 found in string ?
 	aghi	%r2,1		# strnlen_user result includes the \0
-1:	slgr	%r2,%r3
+				# or return count+1 if \0 not found
+	slgr	%r2,%r3
 	br	%r14
 2:	sacf	0
-	lghi	%r2,-EFAULT
+	slgr	%r2,%r2		# return 0 on exception
 	br	%r14
 	.section __ex_table,"a"
 	.quad	0b,2b
diff -urpN linux-2.6/arch/s390/lib/uaccess.S linux-2.6-patched/arch/s390/lib/uaccess.S
--- linux-2.6/arch/s390/lib/uaccess.S	2006-01-03 04:21:10.000000000 +0100
+++ linux-2.6-patched/arch/s390/lib/uaccess.S	2006-03-07 07:59:22.000000000 +0100
@@ -198,12 +198,12 @@ __strnlen_user_asm:
 0:	srst	%r2,%r1
 	jo	0b
 	sacf	0
-	jh	1f		# \0 found in string ?
 	ahi	%r2,1		# strnlen_user result includes the \0
-1:	slr	%r2,%r3
+				# or return count+1 if \0 not found
+	slr	%r2,%r3
 	br	%r14
 2:	sacf	0
-	lhi	%r2,-EFAULT
+	slr	%r2,%r2		# return 0 on exception
 	br	%r14
 	.section __ex_table,"a"
 	.long	0b,2b
-
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