[3.11.y.z extended stable] Patch "qla2xxx: Fix kernel panic on selective retransmission request" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    qla2xxx: Fix kernel panic on selective retransmission request

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

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>From 3dbea55fcef3c8a7af33861887ce1bcf7cfac256 Mon Sep 17 00:00:00 2001
From: "Dr. Greg Wettstein" <greg at enjellic.com>
Date: Mon, 24 Feb 2014 13:59:53 -0600
Subject: qla2xxx: Fix kernel panic on selective retransmission request

commit 6f58c780e5a5b43a6d2121e0d43cdcba1d3cc5fc upstream.

A selective retransmission request (SRR) is a fibre-channel
protocol control request which provides support for requesting
retransmission of a data sequence in response to an issue such as
frame loss or corruption.  These events are experienced
infrequently in fibre-channel based networks which makes
it difficult to test and assess codepaths which handle these
events.

We were fortunate enough, for some definition of fortunate, to
have a metro-area single-mode SAN link which, at 10 GBPS
sustained load levels, would consistently generate SRR's in
a SCST based target implementation using our SCST/in-kernel
Qlogic target interface driver.  In response to an SRR the
in-kernel Qlogic target driver immediately panics resulting
in a catastrophic storage failure for serviced initiators.

The culprit was a debug statement in the qla_target.c file which
does not verify that a pointer to the SCSI CDB is not null.
The unchecked pointer dereference results in the kernel panic
and resultant system failure.

The other two references to the SCSI CDB by the SRR handling code
use a ternary operator to verify a non-null pointer is being
acted on.  This patch simply adds a similar test to the implicated
debug statement.

This patch is a candidate for any stable kernel being maintained
since it addresses a potentially catastrophic event with
minimal downside.

Signed-off-by: Dr. Greg Wettstein <greg at enjellic.com>
Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/scsi/qla2xxx/qla_target.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 2a636c1..ba580ad 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -3215,7 +3215,8 @@ restart:
 		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf02c,
 		    "SRR cmd %p (se_cmd %p, tag %d, op %x), "
 		    "sg_cnt=%d, offset=%d", cmd, &cmd->se_cmd, cmd->tag,
-		    se_cmd->t_task_cdb[0], cmd->sg_cnt, cmd->offset);
+		    se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
+		    cmd->sg_cnt, cmd->offset);

 		qlt_handle_srr(vha, sctio, imm);

--
1.9.0