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CIFS: Fix a possible memory corruption during reconnect

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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.

CC: Stable <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
This commit is contained in:
Pavel Shilovsky 2016-11-04 11:50:31 -07:00
commit 53e0e11efe
5 changed files with 85 additions and 31 deletions
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