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| author | Miklos Szeredi <mszeredi@suse.cz> | 2014-07-07 15:28:51 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2014-07-07 15:28:51 +0200 |
| commit | 233a01fa9c4c7c41238537e8db8434667ff28a2f (patch) | |
| tree | eea525a1e50caf4f9fd3a67e62e36c15f28d645d /fs/fuse/inode.c | |
| parent | fuse: inode: drop cast (diff) | |
| download | linux-233a01fa9c4c7c41238537e8db8434667ff28a2f.tar.xz linux-233a01fa9c4c7c41238537e8db8434667ff28a2f.zip | |
fuse: handle large user and group ID
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@suse.cz>
Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/fuse/inode.c')
| -rw-r--r-- | fs/fuse/inode.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 7b8fc7d33def..8474028d7848 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -478,6 +478,17 @@ 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; @@ -488,6 +499,7 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) while ((p = strsep(&opt, ",")) != NULL) { int token; int value; + unsigned uv; substring_t args[MAX_OPT_ARGS]; if (!*p) continue; @@ -511,18 +523,18 @@ static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev) break; case OPT_USER_ID: - if (match_int(&args[0], &value)) + if (fuse_match_uint(&args[0], &uv)) return 0; - d->user_id = make_kuid(current_user_ns(), value); + d->user_id = make_kuid(current_user_ns(), uv); if (!uid_valid(d->user_id)) return 0; 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 = make_kgid(current_user_ns(), value); + d->group_id = make_kgid(current_user_ns(), uv); if (!gid_valid(d->group_id)) return 0; d->group_id_present = 1; |