linux-kernel - [PATCH V3 1/2] scsi: qla2xxx: Fix double free of fcport in qla24xx_els_dcmd

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Message-Id: <20240430091144.10744-1-hyperlyzcs@gmail.com>
Date: Tue, 30 Apr 2024 17:11:43 +0800
From: Yongzhi Liu <hyperlyzcs@...il.com>
To: skashyap@...vell.com,
	Markus.Elfring@....de,
	njavali@...vell.com,
	martin.petersen@...cle.com,
	James.Bottomley@...senPartnership.com
Cc: himanshu.madhani@...cle.com,
	GR-QLogic-Storage-Upstream@...vell.com,
	linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	jitxie@...cent.com,
	huntazhang@...cent.com,
	Yongzhi Liu <hyperlyzcs@...il.com>
Subject: [PATCH V3 1/2] scsi: qla2xxx: Fix double free of fcport in qla24xx_els_dcmd_iocb

When dma_alloc_coherent() or qla2x00_start_sp() return an error,
the callback function qla2x00_els_dcmd_sp_free in qla2x00_sp_release
will call qla2x00_free_fcport() to kfree fcport. We shouldn't call
qla2x00_free_fcport() again in the error handling path.

Fix this by cleaning the duplicate qla2x00_free_fcport() calls up.

Fixes: 82f522ae0d97 ("scsi: qla2xxx: Fix double free of fcport")
Signed-off-by: Yongzhi Liu <hyperlyzcs@...il.com>
---
V2 -> V3: Improve patch summary and provide a patch serises with two separate update steps
V1 -> V2: Optimisation of exception handling

 drivers/scsi/qla2xxx/qla_iocb.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index 0b41e8a06602..faec66bd1951 100644
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -2751,7 +2751,6 @@ qla24xx_els_dcmd_iocb(scsi_qla_host_t *vha, int els_opcode,
 	if (!elsio->u.els_logo.els_logo_pyld) {
 		/* ref: INIT */
 		kref_put(&sp->cmd_kref, qla2x00_sp_release);
-		qla2x00_free_fcport(fcport);
 		return QLA_FUNCTION_FAILED;
 	}
 
@@ -2776,7 +2775,6 @@ qla24xx_els_dcmd_iocb(scsi_qla_host_t *vha, int els_opcode,
 	if (rval != QLA_SUCCESS) {
 		/* ref: INIT */
 		kref_put(&sp->cmd_kref, qla2x00_sp_release);
-		qla2x00_free_fcport(fcport);
 		return QLA_FUNCTION_FAILED;
 	}
 
-- 
2.36.1