cifs: fix check of rc in function generate_smb3signingkey

[ Upstream commit 181724fc72486dec2bec8803459be05b5162aaa8 ]

Remove extra check after condition, add check after generating key
for encryption. The check is needed to return non zero rc before
rewriting it with generating key for decryption.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Reviewed-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Fixes: d70e9fa55884 ("cifs: try opening channels after mounting")
Signed-off-by: Ekaterina Esina <eesina@astralinux.ru>
Co-developed-by: Anastasia Belova <abelova@astralinux.ru>
Signed-off-by: Anastasia Belova <abelova@astralinux.ru>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/smb/client/smb2transport.c b/fs/smb/client/smb2transport.c
index 23c50ed..a136fc4 100644 (file)
--- a/fs/smb/client/smb2transport.c
+++ b/fs/smb/client/smb2transport.c
@@ -452,6 +452,8 @@ generate_smb3signingkey(struct cifs_ses *ses,
                                  ptriplet->encryption.context,
                                  ses->smb3encryptionkey,
                                  SMB3_ENC_DEC_KEY_SIZE);
+               if (rc)
+                       return rc;
                rc = generate_key(ses, ptriplet->decryption.label,
                                  ptriplet->decryption.context,
                                  ses->smb3decryptionkey,
@@ -460,9 +462,6 @@ generate_smb3signingkey(struct cifs_ses *ses,
                        return rc;
        }
 
-       if (rc)
-               return rc;
-
 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
        cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
        /*