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authorKonstantin Khlebnikov <koct9i@gmail.com>2014-06-17 06:58:05 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-30 20:12:02 -0700
commitb0d3f527adbe90799e10000a0c59e88f0174bfaf (patch)
treecfe6fdb21570db8c056c097f936c309ce1d1753f /mm
parentb83627d417975fa8681344384ac55a1c4751f55f (diff)
epoll: fix use-after-free in eventpoll_release_file
commit ebe06187bf2aec10d537ce4595e416035367d703 upstream. This fixes use-after-free of epi->fllink.next inside list loop macro. This loop actually releases elements in the body. The list is rcu-protected but here we cannot hold rcu_read_lock because we need to lock mutex inside. The obvious solution is to use list_for_each_entry_safe(). RCU-ness isn't essential because nobody can change this list under us, it's final fput for this file. The bug was introduced by ae10b2b4eb01 ("epoll: optimize EPOLL_CTL_DEL using rcu") Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Reported-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Jason Baron <jbaron@akamai.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions