cifs: writing past end of struct in cifs_convert_address()

"s6->sin6_scope_id" is an int bits but strict_strtoul() writes a long
so this can corrupt memory on 64 bit systems.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index dd23a32..581c225 100644 (file)
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -197,8 +197,7 @@ cifs_convert_address(struct sockaddr *dst, const char *src, int len)
                memcpy(scope_id, pct + 1, slen);
                scope_id[slen] = '\0';
 
-               rc = strict_strtoul(scope_id, 0,
-                                       (unsigned long *)&s6->sin6_scope_id);
+               rc = kstrtouint(scope_id, 0, &s6->sin6_scope_id);
                rc = (rc == 0) ? 1 : 0;
        }