cifs: fix workstation_name for multiuser mounts

Set workstation_name from the master_tcon for multiuser mounts.

Just in case, protect size_of_ntlmssp_blob against a NULL workstation_name.

Fixes: 27e2b9c1c834 ("cifs: send workstation name during ntlmssp session setup")
Cc: stable@vger.kernel.org # 5.16
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Ryan Bair <ryandbair@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 5a51a098b8454a79c1a85f48c8806982ea671d7d..0b742bd5064252abbae2b6300b506daf29c873e3 100644 (file)
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1977,6 +1977,19 @@ cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
                }
        }
 
+       ctx->workstation_name = kstrdup(ses->workstation_name, GFP_KERNEL);
+       if (!ctx->workstation_name) {
+               cifs_dbg(FYI, "Unable to allocate memory for workstation_name\n");
+               rc = -ENOMEM;
+               kfree(ctx->username);
+               ctx->username = NULL;
+               kfree_sensitive(ctx->password);
+               ctx->password = NULL;
+               kfree(ctx->domainname);
+               ctx->domainname = NULL;
+               goto out_key_put;
+       }
+
 out_key_put:
        up_read(&key->sem);
        key_put(key);

diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index dc3b16d1be09aca808286134976e1a4efda7fb6c..5723d50340e5e8df4bfff941fa6d44716c1c3a2c 100644 (file)
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -713,7 +713,11 @@ static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
        else
                sz += sizeof(__le16);
 
-       sz += sizeof(__le16) * strnlen(ses->workstation_name, CIFS_MAX_WORKSTATION_LEN);
+       if (ses->workstation_name)
+               sz += sizeof(__le16) * strnlen(ses->workstation_name,
+                       CIFS_MAX_WORKSTATION_LEN);
+       else
+               sz += sizeof(__le16);
 
        return sz;
 }