linux-kernel - [resend] [patch] [SCSI] bfa: dereferencing freed memory in bfad_im

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Message-ID: <20120229125933.GA23250@elgon.mountain>
Date:	Wed, 29 Feb 2012 15:59:33 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Jing Huang <huangj@...cade.com>
Cc:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	"open list:BROCADE BFA FC SC..." <linux-scsi@...r.kernel.org>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [resend] [patch] [SCSI] bfa: dereferencing freed memory in
 bfad_im_probe()

If bfad_thread_workq(bfad) was not BFA_STATUS_OK then we freed "im"
and then dereferenced it.

I did a little clean up because it seemed nicer to return directly
instead of doing a superfluous goto.  I looked at other functions in
this file and it seems like returning directly is standard.

Signed-off-by: Dan Carpenter <error27@...il.com>
---
I sent this last July and asked about it again in November but I never
heard back.  It still applies fine with 2 lines of fuzz.

diff --git a/drivers/scsi/bfa/bfad_im.c b/drivers/scsi/bfa/bfad_im.c
index 0131238..7f7cca0 100644
--- a/drivers/scsi/bfa/bfad_im.c
+++ b/drivers/scsi/bfa/bfad_im.c
@@ -685,25 +685,21 @@ bfa_status_t
 bfad_im_probe(struct bfad_s *bfad)
 {
 	struct bfad_im_s      *im;
-	bfa_status_t    rc = BFA_STATUS_OK;
 
 	im = kzalloc(sizeof(struct bfad_im_s), GFP_KERNEL);
-	if (im == NULL) {
-		rc = BFA_STATUS_ENOMEM;
-		goto ext;
-	}
+	if (im == NULL)
+		return BFA_STATUS_ENOMEM;
 
 	bfad->im = im;
 	im->bfad = bfad;
 
 	if (bfad_thread_workq(bfad) != BFA_STATUS_OK) {
 		kfree(im);
-		rc = BFA_STATUS_FAILED;
+		return BFA_STATUS_FAILED;
 	}
 
 	INIT_WORK(&im->aen_im_notify_work, bfad_aen_im_notify_handler);
-ext:
-	return rc;
+	return BFA_STATUS_OK;
 }
 
 void
--
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