[PATCH] ncpfs: ensure we free wdog_pid on parse_option or fill_inode …

…failure

This took a little refactoring but now errors are handled cleanly.  When
this code used pid_t values this wasn't necessary because you can't
leak a pid_t.

Thanks to Peter Vandrovec for spotting this.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Peter Vandrovec <vandrove@vc.cvut.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/ncpfs/inode.c

@@ -327,6 +327,7 @@ static int ncp_parse_options(struct ncp_mount_data_kernel *data, char *options)
 	char *optarg;
 	unsigned long optint;
 	int version = 0;
+	int ret;
 
 	data->flags = 0;
 	data->int_flags = 0;
@@ -343,8 +344,9 @@ static int ncp_parse_options(struct ncp_mount_data_kernel *data, char *options)
 	data->mounted_vol[0] = 0;
 
 	while ((optval = ncp_getopt("ncpfs", &options, ncp_opts, NULL, &optarg, &optint)) != 0) {
-		if (optval < 0)
-			return optval;
+		ret = optval;
+		if (ret < 0)
+			goto err;
 		switch (optval) {
 			case 'u':
 				data->uid = optint;
@@ -380,18 +382,21 @@ static int ncp_parse_options(struct ncp_mount_data_kernel *data, char *options)
 				data->info_fd = optint;
 				break;
 			case 'v':
-				if (optint < NCP_MOUNT_VERSION_V4) {
-					return -ECHRNG;
-				}
-				if (optint > NCP_MOUNT_VERSION_V5) {
-					return -ECHRNG;
-				}
+				ret = -ECHRNG;
+				if (optint < NCP_MOUNT_VERSION_V4)
+					goto err;
+				if (optint > NCP_MOUNT_VERSION_V5)
+					goto err;
 				version = optint;
 				break;
 
 		}
 	}
 	return 0;
+err:
+	put_pid(data->wdog_pid);
+	data->wdog_pid = NULL;
+	return ret;
 }
 
 static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
@@ -409,6 +414,7 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
 #endif
 	struct ncp_entry_info finfo;
 
+	data.wdog_pid = NULL;
 	server = kzalloc(sizeof(struct ncp_server), GFP_KERNEL);
 	if (!server)
 		return -ENOMEM;
@@ -679,6 +685,7 @@ static int ncp_fill_super(struct super_block *sb, void *raw_data, int silent)
 	 */
 	fput(ncp_filp);
 out:
+	put_pid(data.wdog_pid);
 	sb->s_fs_info = NULL;
 	kfree(server);
 	return error;