afs: Fix dynamic root getattr

The recent patch to make afs_getattr consult the server didn't account
for the pseudo-inodes employed by the dynamic root-type afs superblock
not having a volume or a server to access, and thus an oops occurs if
such a directory is stat'd.

Fix this by checking to see if the vnode->volume pointer actually points
anywhere before following it in afs_getattr().

This can be tested by stat'ing a directory in /afs.  It may be
sufficient just to do "ls /afs" and the oops looks something like:

        BUG: kernel NULL pointer dereference, address: 0000000000000020
        ...
        RIP: 0010:afs_getattr+0x8b/0x14b
        ...
        Call Trace:
         <TASK>
         vfs_statx+0x79/0xf5
         vfs_fstatat+0x49/0x62

Fixes: 2aeb8c86d499 ("afs: Fix afs_getattr() to refetch file status if callback break occurred")
Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
Tested-by: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
Link: https://lore.kernel.org/r/165408450783.1031787.7941404776393751186.stgit@warthog.procyon.org.uk/
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 89630acbc2cc5410ae0d326c29e45b49f5041a98..64dab70d4a4f3af59869d4473bb0096ceea9905d 100644 (file)
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -745,7 +745,8 @@ int afs_getattr(struct user_namespace *mnt_userns, const struct path *path,
 
        _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
 
-       if (!(query_flags & AT_STATX_DONT_SYNC) &&
+       if (vnode->volume &&
+           !(query_flags & AT_STATX_DONT_SYNC) &&
            !test_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) {
                key = afs_request_key(vnode->volume->cell);
                if (IS_ERR(key))