fs/smb/client: Reset password pointer to NULL

jira VULN-9356
cve CVE-2023-5345
commit-author Quang Le <[email protected]>
commit e6e43b8

Forget to reset ctx->password to NULL will lead to bug like double free

	Cc: [email protected]
	Cc: Willy Tarreau <[email protected]>
	Reviewed-by: Namjae Jeon <[email protected]>
	Signed-off-by: Quang Le <[email protected]>
	Signed-off-by: Steve French <[email protected]>
(cherry picked from commit e6e43b8)
	Signed-off-by: Marcin Wcisło <[email protected]>

# Conflicts:
#	fs/cifs/fs_context.c

Author: pvts-mat

fs/cifs/fs_context.c

@@ -1458,6 +1458,8 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 	return 0;
 
  cifs_parse_mount_err:
+	kfree_sensitive(ctx->password);
+	ctx->password = NULL;
 	return -EINVAL;
 }