[PATCH] fuse: stricter mount option checking

Check for the presence of all mandatory mount options.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 2 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index c8e54c0658f..298c1d4c153 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -32,6 +32,10 @@ struct fuse_mount_data {
         unsigned rootmode;
         unsigned user_id;
         unsigned group_id;
+        unsigned fd_present : 1;
+        unsigned rootmode_present : 1;
+        unsigned user_id_present : 1;
+        unsigned group_id_present : 1;
         unsigned flags;
         unsigned max_read;
 };
@@ -274,7 +278,6 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
 {
         char *p;
         memset(d, 0, sizeof(struct fuse_mount_data));
-        d->fd = -1;
         d->max_read = ~0;
 
         while ((p = strsep(&opt, ",")) != NULL) {
@@ -290,24 +293,28 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
                         if (match_int(&args[0], &value))
                                 return 0;
                         d->fd = value;
+                        d->fd_present = 1;
                         break;
 
                 case OPT_ROOTMODE:
                         if (match_octal(&args[0], &value))
                                 return 0;
                         d->rootmode = value;
+                        d->rootmode_present = 1;
                         break;
 
                 case OPT_USER_ID:
                         if (match_int(&args[0], &value))
                                 return 0;
                         d->user_id = value;
+                        d->user_id_present = 1;
                         break;
 
                 case OPT_GROUP_ID:
                         if (match_int(&args[0], &value))
                                 return 0;
                         d->group_id = value;
+                        d->group_id_present = 1;
                         break;
 
                 case OPT_DEFAULT_PERMISSIONS:
@@ -332,7 +339,9 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d)
                         return 0;
                 }
         }
-        if (d->fd == -1)
+
+        if (!d->fd_present || !d->rootmode_present ||
+            !d->user_id_present || !d->group_id_present)
                 return 0;
 
         return 1;