linux-kernel - [PATCH 4.19 122/149] scsi: target: cxgbit: Fix cxgbit_fw4

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Message-Id: <20191104212144.845622925@linuxfoundation.org>
Date:   Mon,  4 Nov 2019 22:45:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Varun Prakash <varun@...lsio.com>,
        Nicholas Bellinger <nab@...ux-iscsi.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Bart Van Assche <bvanassche@....org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.19 122/149] scsi: target: cxgbit: Fix cxgbit_fw4_ack()

From: Bart Van Assche <bvanassche@....org>

commit fc5b220b2dcf8b512d9bd46fd17f82257e49bf89 upstream.

Use the pointer 'p' after having tested that pointer instead of before.

Fixes: 5cadafb236df ("target/cxgbit: Fix endianness annotations")
Cc: Varun Prakash <varun@...lsio.com>
Cc: Nicholas Bellinger <nab@...ux-iscsi.org>
Cc: <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20191023202150.22173-1-bvanassche@acm.org
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/target/iscsi/cxgbit/cxgbit_cm.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/target/iscsi/cxgbit/cxgbit_cm.c
+++ b/drivers/target/iscsi/cxgbit/cxgbit_cm.c
@@ -1832,7 +1832,7 @@ static void cxgbit_fw4_ack(struct cxgbit
 
 	while (credits) {
 		struct sk_buff *p = cxgbit_sock_peek_wr(csk);
-		const u32 csum = (__force u32)p->csum;
+		u32 csum;
 
 		if (unlikely(!p)) {
 			pr_err("csk 0x%p,%u, cr %u,%u+%u, empty.\n",
@@ -1841,6 +1841,7 @@ static void cxgbit_fw4_ack(struct cxgbit
 			break;
 		}
 
+		csum = (__force u32)p->csum;
 		if (unlikely(credits < csum)) {
 			pr_warn("csk 0x%p,%u, cr %u,%u+%u, < %u.\n",
 				csk,  csk->tid,