linux-kernel - [PATCH 4.9 124/148] drivers/rapidio/devices/rio_mport_cdev.c: fix resource leak in error handling path in rio_dma

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Date:   Tue, 12 Dec 2017 13:45:34 +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,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Logan Gunthorpe <logang@...tatee.com>,
        Matt Porter <mporter@...nel.crashing.org>,
        Alexandre Bounine <alexandre.bounine@....com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Jesper Nilsson <jesper.nilsson@...s.com>,
        Christian K_nig <christian.koenig@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 124/148] drivers/rapidio/devices/rio_mport_cdev.c: fix resource leak in error handling path in rio_dma_transfer()

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>


[ Upstream commit b1402dcb5643b7a27d46a05edd7491d49ba0e248 ]

If 'dma_map_sg()', we should branch to the existing error handling path
to free some resources before returning.

Link: http://lkml.kernel.org/r/61292a4f369229eee03394247385e955027283f8.1505687047.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Reviewed-by: Logan Gunthorpe <logang@...tatee.com>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Alexandre Bounine <alexandre.bounine@....com>
Cc: Lorenzo Stoakes <lstoakes@...il.com>
Cc: Jesper Nilsson <jesper.nilsson@...s.com>
Cc: Christian K_nig <christian.koenig@....com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/rapidio/devices/rio_mport_cdev.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -964,7 +964,8 @@ rio_dma_transfer(struct file *filp, u32
 			   req->sgt.sgl, req->sgt.nents, dir);
 	if (nents == -EFAULT) {
 		rmcd_error("Failed to map SG list");
-		return -EFAULT;
+		ret = -EFAULT;
+		goto err_pg;
 	}
 
 	ret = do_dma_request(req, xfer, sync, nents);