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| author | Jan Kara <jack@suse.cz> | 2016-10-04 13:44:06 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2016-10-18 11:28:21 +0200 |
| commit | a2ed0b391dd9c3ef1d64c7c3e370f4a5ffcd324a (patch) | |
| tree | e6dd0a9195fabdddf52a0076b2931a2057adf3d9 /fs/isofs | |
| parent | 1573d2caf713874cfe0d1336c823d0fb548d8bed (diff) | |
| download | linux-stable-a2ed0b391dd9c3ef1d64c7c3e370f4a5ffcd324a.tar.gz linux-stable-a2ed0b391dd9c3ef1d64c7c3e370f4a5ffcd324a.tar.bz2 linux-stable-a2ed0b391dd9c3ef1d64c7c3e370f4a5ffcd324a.zip | |
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.c | 8 |
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); } |