From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: John Garry <john.garry@huawei.com>,
"James E.J. Bottomley" <jejb@linux.vnet.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Xiang Chen <chenxiang66@hisilicon.com>
Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH v2] scsi: hisi_sas: Fix NULL pointer dereference
Date: Thu, 18 Oct 2018 18:59:39 +0200 [thread overview]
Message-ID: <20181018165939.GA26491@embeddedor.com> (raw)
There is a NULL pointer dereference in case *slot* happens to
be NULL at lines 1053 and 1878:
struct hisi_sas_cq *cq =
&hisi_hba->cq[slot->dlvry_queue];
Notice that *slot* is being NULL checked at lines 1057 and 1881:
if (slot), which implies it may be NULL.
Fix this by placing the declaration and definition of variable cq,
which contains the pointer dereference slot->dlvry_queue, after
slot has been properly NULL checked.
Addresses-Coverity-ID: 1474515 ("Dereference before null check")
Addresses-Coverity-ID: 1474520 ("Dereference before null check")
Fixes: 584f53fe5f52 ("scsi: hisi_sas: Fix the race between IO completion and timeout for SMP/internal IO")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
Changes in v2:
- Fix another instance of the same issue at line 1053.
- Update commit log.
drivers/scsi/hisi_sas/hisi_sas_main.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 2e5eaf1..b3f01d5 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -1050,11 +1050,11 @@ static int hisi_sas_exec_internal_tmf_task(struct domain_device *device,
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
struct hisi_sas_slot *slot = task->lldd_task;
- struct hisi_sas_cq *cq =
- &hisi_hba->cq[slot->dlvry_queue];
dev_err(dev, "abort tmf: TMF task timeout and not done\n");
if (slot) {
+ struct hisi_sas_cq *cq =
+ &hisi_hba->cq[slot->dlvry_queue];
/*
* flush tasklet to avoid free'ing task
* before using task in IO completion
@@ -1875,10 +1875,10 @@ hisi_sas_internal_task_abort(struct hisi_hba *hisi_hba,
if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
struct hisi_sas_slot *slot = task->lldd_task;
- struct hisi_sas_cq *cq =
- &hisi_hba->cq[slot->dlvry_queue];
if (slot) {
+ struct hisi_sas_cq *cq =
+ &hisi_hba->cq[slot->dlvry_queue];
/*
* flush tasklet to avoid free'ing task
* before using task in IO completion
--
2.7.4
next reply other threads:[~2018-10-18 17:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-18 16:59 Gustavo A. R. Silva [this message]
2018-10-19 0:54 ` [PATCH v2] scsi: hisi_sas: Fix NULL pointer dereference chenxiang (M)
2018-10-19 22:28 ` Martin K. Petersen
2018-10-20 6:34 ` Gustavo A. R. Silva
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20181018165939.GA26491@embeddedor.com \
--to=gustavo@embeddedor.com \
--cc=chenxiang66@hisilicon.com \
--cc=jejb@linux.vnet.ibm.com \
--cc=john.garry@huawei.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-scsi@vger.kernel.org \
--cc=martin.petersen@oracle.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).