CIFS: Make cifs_convert_address() take a const src pointer and a length
Make cifs_convert_address() take a const src pointer and a length so that all
the strlen() calls in their can be cut out and to make it unnecessary to modify
the src string.
Also return the data length from dns_resolve_server_name_to_ip() so that a
strlen() can be cut out of cifs_compose_mount_options() too.
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/dns_resolve.c b/fs/cifs/dns_resolve.c
index 3ad7f43..aa967e7 100644
--- a/fs/cifs/dns_resolve.c
+++ b/fs/cifs/dns_resolve.c
@@ -40,11 +40,11 @@
* 0 - name is not IP
*/
static int
-is_ip(char *name)
+is_ip(const char *name, int len)
{
struct sockaddr_storage ss;
- return cifs_convert_address((struct sockaddr *)&ss, name);
+ return cifs_convert_address((struct sockaddr *)&ss, name, len);
}
static int
@@ -54,6 +54,10 @@
int rc = 0;
char *ip;
+ /* make sure this looks like an address */
+ if (!is_ip(data, datalen))
+ return -EINVAL;
+
ip = kmalloc(datalen + 1, GFP_KERNEL);
if (!ip)
return -ENOMEM;
@@ -61,12 +65,6 @@
memcpy(ip, data, datalen);
ip[datalen] = '\0';
- /* make sure this looks like an address */
- if (!is_ip(ip)) {
- kfree(ip);
- return -EINVAL;
- }
-
key->type_data.x[0] = datalen;
key->payload.data = ip;
@@ -93,7 +91,7 @@
* unc - server UNC
* output:
* *ip_addr - pointer to server ip, caller responcible for freeing it.
- * return 0 on success
+ * return the length of the returned string on success
*/
int
dns_resolve_server_name_to_ip(const char *unc, char **ip_addr)
@@ -131,7 +129,7 @@
memcpy(name, unc+2, len);
name[len] = 0;
- if (is_ip(name)) {
+ if (is_ip(name, len)) {
cFYI(1, "%s: it is IP, skipping dns upcall: %s",
__func__, name);
data = name;
@@ -164,7 +162,7 @@
name,
*ip_addr
);
- rc = 0;
+ rc = len;
} else {
rc = -ENOMEM;
}