tree fe2ba9ffc02a74fb38c7903482aeae4868a399ff
parent 6dcb01e7833369acd7ff3b54f49a0a99f4fdf6c2
author Pavel Shilovsky <pshilov@microsoft.com> 1478285431 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1483697775 +0100

CIFS: Fix a possible memory corruption during reconnect

commit 53e0e11efe9289535b060a51d4cf37c25e0d0f2b upstream.

We can not unlock/lock cifs_tcp_ses_lock while walking through ses
and tcon lists because it can corrupt list iterator pointers and
a tcon structure can be released if we don't hold an extra reference.
Fix it by moving a reconnect process to a separate delayed work
and acquiring a reference to every tcon that needs to be reconnected.
Also do not send an echo request on newly established connections.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>