linux-kernel - [PATCH] qedi: Fix a possible sleep-in-atomic bug in qedi_process_tmf

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Message-Id: <1513156268-13328-1-git-send-email-baijiaju1990@gmail.com>
Date:   Wed, 13 Dec 2017 17:11:08 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     QLogic-Storage-Upstream@...ium.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] qedi: Fix a possible sleep-in-atomic bug in qedi_process_tmf_resp

The driver may sleep under a spinlock.
The function call path is:
qedi_cpu_offline (acquire the spinlock)
  qedi_fp_process_cqes
    qedi_mtask_completion
      qedi_process_tmf_resp
        kzalloc(GFP_KERNEL) --> may sleep

To fix it, GFP_KERNEL is replaced with GFP_ATOMIC.

This bug is found by my static analysis tool(DSAC) and checked by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 drivers/scsi/qedi/qedi_fw.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/qedi/qedi_fw.c b/drivers/scsi/qedi/qedi_fw.c
index bd302d3..20a9259 100644
--- a/drivers/scsi/qedi/qedi_fw.c
+++ b/drivers/scsi/qedi/qedi_fw.c
@@ -198,7 +198,7 @@ static void qedi_process_tmf_resp(struct qedi_ctx *qedi,
 	cqe_tmp_response = &cqe->cqe_common.iscsi_hdr.tmf_response;
 
 	qedi_cmd = task->dd_data;
-	qedi_cmd->tmf_resp_buf = kzalloc(sizeof(*resp_hdr_ptr), GFP_KERNEL);
+	qedi_cmd->tmf_resp_buf = kzalloc(sizeof(*resp_hdr_ptr), GFP_ATOMIC);
 	if (!qedi_cmd->tmf_resp_buf) {
 		QEDI_ERR(&qedi->dbg_ctx,
 			 "Failed to allocate resp buf, cid=0x%x\n",
-- 
1.7.9.5