[04/23] powerpc: Fix handling of strncmp with zero len

Greg KH
2010-07-01T18:14:41Z

2.6.27-stable review patch. If anyone has any objections, please let us know.

------------------

From: Jeff Mahoney <jeffm@suse.com>

commit 637a99022fb119b90fb281715d13172f0394fc12 upstream.

Commit 0119536c, which added the assembly version of strncmp to
powerpc, mentions that it adds two instructions to the version from
boot/string.S to allow it to handle len=0. Unfortunately, it doesn't
always return 0 when that is the case. The length is passed in r5, but
the return value is passed back in r3. In certain cases, this will
happen to work. Otherwise it will pass back the address of the first
string as the return value.

This patch lifts the len <= 0 handling code from memcpy to handle that
case.

Reported by: Christian_Sellars@symantec.com
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
arch/powerpc/lib/string.S | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/powerpc/lib/string.S
+++ b/arch/powerpc/lib/string.S
@@ -71,7 +71,7 @@ _GLOBAL(strcmp)

_GLOBAL(strncmp)
PPC_LCMPI r5,0
- beqlr
+ ble- 2f
mtctr r5
addi r5,r3,-1
addi r4,r4,-1
@@ -82,6 +82,8 @@ _GLOBAL(strncmp)
beqlr 1
bdnzt eq,1b
blr
+2: li r3,0
+ blr

_GLOBAL(strlen)
addi r4,r3,-1