[CIFS] potential NULL dereference in parse_DFS_referrals()

memory allocation may fail, prevent a NULL dereference

Pointed out by Roel Kluin

CC: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 1866bc2927d4f376182e98e71182fcff345f0a71..5f0b80d39923d0236b8a4b42b0377db02e27680a 100644 (file)
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -3961,6 +3961,10 @@ parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr,
                if (is_unicode) {
                        __le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
                                                GFP_KERNEL);
+                       if (tmp == NULL) {
+                               rc = -ENOMEM;
+                               goto parse_DFS_referrals_exit;
+                       }
                        cifsConvertToUCS((__le16 *) tmp, searchName,
                                        PATH_MAX, nls_codepage, remap);
                        node->path_consumed = cifs_ucs2_bytes(tmp,