MIPS: Fix strnlen_user() return value in case of overlong strings.

We were returning maxlen like the userland strnlen if no '\0' character
was encountered while the kernel version is expected to return a value
larger than maxlen.  Fixed to return maxlen + 1.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/mips/lib/strnlen_user.S b/arch/mips/lib/strnlen_user.S
index f3af6995e2a6..7d12c0dded3d 100644
--- a/arch/mips/lib/strnlen_user.S
+++ b/arch/mips/lib/strnlen_user.S
@@ -40,9 +40,11 @@ FEXPORT(__strnlen_\func\()_nocheck_asm)
 .else
         EX(lbe, t0, (v0), .Lfault\@)
 .endif
-        PTR_ADDIU       v0, 1
+        .set            noreorder
         bnez            t0, 1b
-1:      PTR_SUBU        v0, a0
+1:       PTR_ADDIU      v0, 1
+        .set            reorder
+        PTR_SUBU        v0, a0
         jr              ra
         END(__strnlen_\func\()_asm)