s390/cmm: make copy_from_user() invocation provably correct
Get rid of these two warnings:
In function 'copy_from_user',
inlined from 'cmm_timeout_handler' at arch/s390/mm/cmm.c:310:
uaccess.h:303: warning: call to 'copy_from_user_overflow' declared
with attribute warning: copy_from_user() buffer size is not provably
correct
In function 'copy_from_user',
inlined from 'cmm_pages_handler' at arch/s390/mm/cmm.c:270:
uaccess.h:303: warning: call to 'copy_from_user_overflow' declared
with attribute warning: copy_from_user() buffer size is not provably
correct
Change the "len" type to unsigned int, so we can make sure that there is no
buffer overflow. This also generates less code.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
index 9d84a1f..7674130 100644
--- a/arch/s390/mm/cmm.c
+++ b/arch/s390/mm/cmm.c
@@ -257,8 +257,8 @@
size_t *lenp, loff_t *ppos)
{
char buf[16], *p;
+ unsigned int len;
long nr;
- int len;
if (!*lenp || (*ppos && !write)) {
*lenp = 0;
@@ -298,7 +298,7 @@
{
char buf[64], *p;
long nr, seconds;
- int len;
+ unsigned int len;
if (!*lenp || (*ppos && !write)) {
*lenp = 0;