From: Johannes Thumshirn <jthumshirn@suse.de>
To: James Bottomley <jejb@linux.vnet.ibm.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>
Cc: Linux SCSI Mailinglist <linux-scsi@vger.kernel.org>,
Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>,
Johannes Thumshirn <jthumshirn@suse.de>
Subject: [PATCH] qla2xxx: setup data needed in ISR before setting up the ISR
Date: Wed, 6 Jul 2016 09:51:50 +0200 [thread overview]
Message-ID: <1467791510-5307-1-git-send-email-jthumshirn@suse.de> (raw)
qla2xxx first calls request_irq() and then does the setup of the queue
entry data needed in the interrupt handlers in when using MSI-X. This
could lead to a NULL pointer dereference when an IRQ fires between the
request_irq() call and the assignment of the qentry data structure to the
rsp->msix field. A possible case for such a race would be in the kdump
case when the HBA's IRQs are still enabled but the driver is undergoing
a new initialisation and thus is not aware of already activated IRQs in
the HBA.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
---
drivers/scsi/qla2xxx/qla_isr.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 5649c20..20743a3 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -3086,6 +3086,8 @@ qla24xx_enable_msix(struct qla_hw_data *ha, struct rsp_que *rsp)
/* Enable MSI-X vectors for the base queue */
for (i = 0; i < 2; i++) {
qentry = &ha->msix_entries[i];
+ qentry->rsp = rsp;
+ rsp->msix = qentry;
if (IS_P3P_TYPE(ha))
ret = request_irq(qentry->vector,
qla82xx_msix_entries[i].handler,
@@ -3097,8 +3099,6 @@ qla24xx_enable_msix(struct qla_hw_data *ha, struct rsp_que *rsp)
if (ret)
goto msix_register_fail;
qentry->have_irq = 1;
- qentry->rsp = rsp;
- rsp->msix = qentry;
/* Register for CPU affinity notification. */
irq_set_affinity_notifier(qentry->vector, &qentry->irq_notify);
@@ -3119,12 +3119,12 @@ qla24xx_enable_msix(struct qla_hw_data *ha, struct rsp_que *rsp)
*/
if (QLA_TGT_MODE_ENABLED() && IS_ATIO_MSIX_CAPABLE(ha)) {
qentry = &ha->msix_entries[ATIO_VECTOR];
+ qentry->rsp = rsp;
+ rsp->msix = qentry;
ret = request_irq(qentry->vector,
qla83xx_msix_entries[ATIO_VECTOR].handler,
0, qla83xx_msix_entries[ATIO_VECTOR].name, rsp);
qentry->have_irq = 1;
- qentry->rsp = rsp;
- rsp->msix = qentry;
}
msix_register_fail:
--
1.8.5.6
next reply other threads:[~2016-07-06 7:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-06 7:51 Johannes Thumshirn [this message]
2016-07-06 9:43 ` [PATCH] qla2xxx: setup data needed in ISR before setting up the ISR Hannes Reinecke
2016-07-14 4:28 ` Martin K. Petersen
2016-07-14 13:50 ` Himanshu Madhani
2016-07-15 19:00 ` Martin K. Petersen
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