linux-kernel - [PATCH 3.16 108/148] scsi: qla4xxx: fix double free bug

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Message-ID: <lsq.1581185940.130738608@decadent.org.uk>
Date:   Sat, 08 Feb 2020 18:20:47 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Manish Rangankar" <mrangankar@...vell.com>,
        "Pan Bian" <bianpan2016@....com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 3.16 108/148] scsi: qla4xxx: fix double free bug

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Pan Bian <bianpan2016@....com>

commit 3fe3d2428b62822b7b030577cd612790bdd8c941 upstream.

The variable init_fw_cb is released twice, resulting in a double free
bug. The call to the function dma_free_coherent() before goto is removed to
get rid of potential double free.

Fixes: 2a49a78ed3c8 ("[SCSI] qla4xxx: added IPv6 support.")
Link: https://lore.kernel.org/r/1572945927-27796-1-git-send-email-bianpan2016@163.com
Signed-off-by: Pan Bian <bianpan2016@....com>
Acked-by: Manish Rangankar <mrangankar@...vell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/scsi/qla4xxx/ql4_mbx.c | 3 ---
 1 file changed, 3 deletions(-)

--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -641,9 +641,6 @@ int qla4xxx_initialize_fw_cb(struct scsi
 
 	if (qla4xxx_get_ifcb(ha, &mbox_cmd[0], &mbox_sts[0], init_fw_cb_dma) !=
 	    QLA_SUCCESS) {
-		dma_free_coherent(&ha->pdev->dev,
-				  sizeof(struct addr_ctrl_blk),
-				  init_fw_cb, init_fw_cb_dma);
 		goto exit_init_fw_cb;
 	}