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authorJan Kara <jack@suse.cz>2016-10-04 14:44:06 +0300
committerJan Kara <jack@suse.cz>2016-10-18 12:28:21 +0300
commita2ed0b391dd9c3ef1d64c7c3e370f4a5ffcd324a (patch)
treee6dd0a9195fabdddf52a0076b2931a2057adf3d9 /fs/isofs
parent1573d2caf713874cfe0d1336c823d0fb548d8bed (diff)
downloadlinux-a2ed0b391dd9c3ef1d64c7c3e370f4a5ffcd324a.tar.xz
isofs: Do not return EACCES for unknown filesystems
When isofs_mount() is called to mount a device read-write, it returns EACCES even before it checks that the device actually contains an isofs filesystem. This may confuse mount(8) which then tries to mount all subsequent filesystem types in read-only mode. Fix the problem by returning EACCES only once we verify that the device indeed contains an iso9660 filesystem. CC: stable@vger.kernel.org Fixes: 17b7f7cf58926844e1dd40f5eb5348d481deca6a Reported-by: Kent Overstreet <kent.overstreet@gmail.com> Reported-by: Karel Zak <kzak@redhat.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/isofs')
-rw-r--r--fs/isofs/inode.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index ad0c745ebad7..871c8b392099 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -687,6 +687,11 @@ static int isofs_fill_super(struct super_block *s, void *data, int silent)
pri_bh = NULL;
root_found:
+ /* We don't support read-write mounts */
+ if (!(s->s_flags & MS_RDONLY)) {
+ error = -EACCES;
+ goto out_freebh;
+ }
if (joliet_level && (pri == NULL || !opt.rock)) {
/* This is the case of Joliet with the norock mount flag.
@@ -1501,9 +1506,6 @@ struct inode *__isofs_iget(struct super_block *sb,
static struct dentry *isofs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
- /* We don't support read-write mounts */
- if (!(flags & MS_RDONLY))
- return ERR_PTR(-EACCES);
return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
}