tree 318f69dfe1f4e61e6f5fc4d5c634389f1167289e
parent c27d82f52f75fc9d8d9d40d120d2a96fdeeada5e
author Pan Bian <bianpan2016@163.com> 1549059686 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1549064784 -0800

autofs: drop dentry reference only when it is never used

autofs_expire_run() calls dput(dentry) to drop the reference count of
dentry.  However, dentry is read via autofs_dentry_ino(dentry) after
that.  This may result in a use-free-bug.  The patch drops the reference
count of dentry only when it is never used.

Link: http://lkml.kernel.org/r/154725122396.11260.16053424107144453867.stgit@pluto-themaw-net
Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>