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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
This commit is contained in:
Miklos Szeredi 2014-07-07 15:28:51 +02:00
parent 7b3d8bf771
commit 233a01fa9c
1 changed files with 16 additions and 4 deletions
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20
fs/fuse/inode.c
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@ -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;