[PATCH] s390: fix strnlen_user return value

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@redhat.com>.

Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/s390/lib/uaccess64.S b/arch/s390/lib/uaccess64.S
index 50219786fc7a..19b41a33c230 100644
--- a/arch/s390/lib/uaccess64.S
+++ b/arch/s390/lib/uaccess64.S
@@ -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