linux-kernel - [PATCH 3.2 40/94] fuse: handle large user and group ID

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Date:	Mon, 04 Aug 2014 17:48:32 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Miklos Szeredi" <mszeredi@...e.cz>
Subject: [PATCH 3.2 40/94] fuse: handle large user and group ID

3.2.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Miklos Szeredi <mszeredi@...e.cz>

commit 233a01fa9c4c7c41238537e8db8434667ff28a2f upstream.

If the number in "user_id=N" or "group_id=N" mount options was larger than
INT_MAX then fuse returned EINVAL.

Fix this to handle all valid uid/gid values.

Signed-off-by: Miklos Szeredi <mszeredi@...e.cz>
[bwh: Backported to 3.2: no user namespace conversion]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/fuse/inode.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -437,6 +437,17 @@ static const match_table_t tokens = {
 	{OPT_ERR,			NULL}
 };
 
+static int fuse_match_uint(substring_t *s, unsigned int *res)
+{
+	int err = -ENOMEM;
+	char *buf = match_strdup(s);
+	if (buf) {
+		err = kstrtouint(buf, 10, res);
+		kfree(buf);
+	}
+	return err;
+}
+
 static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev)
 {
 	char *p;
@@ -447,6 +458,7 @@ static int parse_fuse_opt(char *opt, str
 	while ((p = strsep(&opt, ",")) != NULL) {
 		int token;
 		int value;
+		unsigned uv;
 		substring_t args[MAX_OPT_ARGS];
 		if (!*p)
 			continue;
@@ -470,16 +482,16 @@ static int parse_fuse_opt(char *opt, str
 			break;
 
 		case OPT_USER_ID:
-			if (match_int(&args[0], &value))
+			if (fuse_match_uint(&args[0], &uv))
 				return 0;
-			d->user_id = value;
+			d->user_id = uv;
 			d->user_id_present = 1;
 			break;
 
 		case OPT_GROUP_ID:
-			if (match_int(&args[0], &value))
+			if (fuse_match_uint(&args[0], &uv))
 				return 0;
-			d->group_id = value;
+			d->group_id = uv;
 			d->group_id_present = 1;
 			break;
 

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