cifs: fix session setup unicode string saving to use new unicode helpers

...and change decode_unicode_ssetup to be a void function. It never
returns an actual error anyway.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 22 insertions, 58 deletions

diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index c652c73760dd..93022dc9babb 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -277,12 +277,11 @@ static void ascii_ssetup_strings(char **pbcc_area, struct cifsSesInfo *ses,
         *pbcc_area = bcc_ptr;
 }
 
-static int decode_unicode_ssetup(char **pbcc_area, int bleft,
-                                 struct cifsSesInfo *ses,
-                                 const struct nls_table *nls_cp)
+static void
+decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifsSesInfo *ses,
+                      const struct nls_table *nls_cp)
 {
-        int rc = 0;
-        int words_left, len;
+        int len;
         char *data = *pbcc_area;
 
         cFYI(1, ("bleft %d", bleft));
@@ -300,63 +299,29 @@ static int decode_unicode_ssetup(char **pbcc_area, int bleft,
                 ++bleft;
         }
 
-        words_left = bleft / 2;
-
-        /* save off server operating system */
-        len = UniStrnlen((wchar_t *) data, words_left);
-
-        if (len >= words_left)
-                return rc;
-
         kfree(ses->serverOS);
-        /* UTF-8 string will not grow more than four times as big as UCS-16 */
-        ses->serverOS = kzalloc((4 * len) + 2 /* trailing null */, GFP_KERNEL);
-        if (ses->serverOS != NULL) {
-                cifs_strfromUCS_le(ses->serverOS, (__le16 *)data, len, nls_cp);
-                cFYI(1, ("serverOS=%s", ses->serverOS));
-        }
-        data += 2 * (len + 1);
-        words_left -= len + 1;
-
-        /* save off server network operating system */
-        len = UniStrnlen((wchar_t *) data, words_left);
-
-        if (len >= words_left)
-                return rc;
+        ses->serverOS = cifs_strndup(data, bleft, true, nls_cp);
+        cFYI(1, ("serverOS=%s", ses->serverOS));
+        len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
+        data += len;
+        bleft -= len;
+        if (bleft <= 0)
+                return;
 
         kfree(ses->serverNOS);
-        ses->serverNOS = kzalloc((4 * len) + 2 /* trailing null */, GFP_KERNEL);
-        if (ses->serverNOS != NULL) {
-                cifs_strfromUCS_le(ses->serverNOS, (__le16 *)data, len,
-                                   nls_cp);
-                cFYI(1, ("serverNOS=%s", ses->serverNOS));
-                if (strncmp(ses->serverNOS, "NT LAN Manager 4", 16) == 0) {
-                        cFYI(1, ("NT4 server"));
-                        ses->flags |= CIFS_SES_NT4;
-                }
-        }
-        data += 2 * (len + 1);
-        words_left -= len + 1;
-
-        /* save off server domain */
-        len = UniStrnlen((wchar_t *) data, words_left);
-
-        if (len > words_left)
-                return rc;
+        ses->serverNOS = cifs_strndup(data, bleft, true, nls_cp);
+        cFYI(1, ("serverNOS=%s", ses->serverNOS));
+        len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
+        data += len;
+        bleft -= len;
+        if (bleft <= 0)
+                return;
 
         kfree(ses->serverDomain);
-        ses->serverDomain = kzalloc((4 * len) + 2, GFP_KERNEL);
-        if (ses->serverDomain != NULL) {
-                cifs_strfromUCS_le(ses->serverDomain, (__le16 *)data, len,
-                                   nls_cp);
-                cFYI(1, ("serverDomain=%s", ses->serverDomain));
-        }
-        data += 2 * (len + 1);
-        words_left -= len + 1;
+        ses->serverDomain = cifs_strndup(data, bleft, true, nls_cp);
+        cFYI(1, ("serverDomain=%s", ses->serverDomain));
 
-        cFYI(1, ("words left: %d", words_left));
-
-        return rc;
+        return;
 }
 
 static int decode_ascii_ssetup(char **pbcc_area, int bleft,
@@ -709,8 +674,7 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
                         ++bcc_ptr;
                         --bytes_remaining;
                 }
-                rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
-                                           ses, nls_cp);
+                decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
         } else {
                 rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining,
                                          ses, nls_cp);