linux-kernel - [patch] mtip32xx: calling kfree() on an error pointer

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Message-ID: <20160106100503.GH23185@mwanda>
Date:	Wed, 6 Jan 2016 13:05:03 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jens Axboe <axboe@...com>, Al Viro <viro@...iv.linux.org.uk>
Cc:	Asai Thambi SP <asamymuthupa@...ron.com>,
	Selvan Mani <smani@...ron.com>, Jeff Moyer <jmoyer@...hat.com>,
	Michal Hocko <mhocko@...e.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] mtip32xx: calling kfree() on an error pointer

If memdup_user() fails then we end up passing an ERR_PTR to kfree()
which is a bug.

Fixes: 85b4d87c9962 ('mtip32xx: don't open-code memdup_user()')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 618c24f..15bec40 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -2032,6 +2032,7 @@ static int exec_drive_taskfile(struct driver_data *dd,
 		outbuf = memdup_user(buf + outtotal, taskout);
 		if (IS_ERR(outbuf)) {
 			err = PTR_ERR(outbuf);
+			outbuf = NULL;
 			goto abort;
 		}
 		outbuf_dma = pci_map_single(dd->pdev,
@@ -2049,6 +2050,7 @@ static int exec_drive_taskfile(struct driver_data *dd,
 		inbuf = memdup_user(buf + intotal, taskin);
 		if (IS_ERR(inbuf)) {
 			err = PTR_ERR(inbuf);
+			inbuf = NULL;
 			goto abort;
 		}
 		inbuf_dma = pci_map_single(dd->pdev,
--
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