This is a note to let you know that I've just added the patch titled
target/tcm_fc: Fix use-after-free of ft_tpg
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
target-tcm_fc-fix-use-after-free-of-ft_tpg.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2c42be2dd4f6586728dba5c4e197afd5cfaded78 Mon Sep 17 00:00:00 2001
From: Andy Grover <agrover@xxxxxxxxxx>
Date: Fri, 4 Apr 2014 16:44:37 -0700
Subject: target/tcm_fc: Fix use-after-free of ft_tpg
From: Andy Grover <agrover@xxxxxxxxxx>
commit 2c42be2dd4f6586728dba5c4e197afd5cfaded78 upstream.
ft_del_tpg checks tpg->tport is set before unlinking the tpg from the
tport when the tpg is being removed. Set this pointer in ft_tport_create,
or the unlinking won't happen in ft_del_tpg and tport->tpg will reference
a deleted object.
This patch sets tpg->tport in ft_tport_create, because that's what
ft_del_tpg checks, and is the only way to get back to the tport to
clear tport->tpg.
The bug was occuring when:
- lport created, tport (our per-lport, per-provider context) is
allocated.
tport->tpg = NULL
- tpg created
- a PRLI is received. ft_tport_create is called, tpg is found and
tport->tpg is set
- tpg removed. ft_tpg is freed in ft_del_tpg. Since tpg->tport was not
set, tport->tpg is not cleared and points at freed memory
- Future calls to ft_tport_create return tport via first conditional,
instead of searching for new tpg by calling ft_lport_find_tpg.
tport->tpg is still invalid, and will access freed memory.
see https://bugzilla.redhat.com/show_bug.cgi?id=1071340
Signed-off-by: Andy Grover <agrover@xxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/tcm_fc/tfc_sess.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/target/tcm_fc/tfc_sess.c
+++ b/drivers/target/tcm_fc/tfc_sess.c
@@ -68,6 +68,7 @@ static struct ft_tport *ft_tport_create(
if (tport) {
tport->tpg = tpg;
+ tpg->tport = tport;
return tport;
}
Patches currently in stable-queue which might be from agrover@xxxxxxxxxx are
queue-3.14/target-tcm_fc-fix-use-after-free-of-ft_tpg.patch
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