tree 2a359efe3c25cac13f68e7847925888fc160bc21
parent 8379bb84be757d5df2d818509faec5d66adb861d
author David Howells <dhowells@redhat.com> 1579018585 +0000
committer Linus Torvalds <torvalds@linux-foundation.org> 1579023606 -0800

afs: Fix use-after-loss-of-ref

afs_lookup() has a tracepoint to indicate the outcome of
d_splice_alias(), passing it the inode to retrieve the fid from.
However, the function gave up its ref on that inode when it called
d_splice_alias(), which may have failed and dropped the inode.

Fix this by caching the fid.

Fixes: 80548b03991f ("afs: Add more tracepoints")
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>