linux-kernel - [PATCH 3.12 068/182] IB/mthca: Return an error on ib_copy_to

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Message-Id: <343ef31e82f332a4f4a4d104449e1645a5d79911.1399973152.git.jslaby@suse.cz>
Date:	Tue, 13 May 2014 11:27:00 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Yann Droneaud <ydroneaud@...eya.com>,
	Roland Dreier <roland@...estorage.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 068/182] IB/mthca: Return an error on ib_copy_to_udata() failure

From: Yann Droneaud <ydroneaud@...eya.com>

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

===============

commit 08e74c4b00c30c232d535ff368554959403d0432 upstream.

In case of error when writing to userspace, the function mthca_create_cq()
does not set an error code before following its error path.

This patch sets the error code to -EFAULT when ib_copy_to_udata() fails.

This was caught when using spatch (aka. coccinelle)
to rewrite call to ib_copy_{from,to}_udata().

Link: https://www.gitorious.org/opteya/coccib/source/75ebf2c1033c64c1d81df13e4ae44ee99c989eba:ib_copy_udata.cocci
Link: http://marc.info/?i=cover.1394485254.git.ydroneaud@opteya.com
Signed-off-by: Yann Droneaud <ydroneaud@...eya.com>
Signed-off-by: Roland Dreier <roland@...estorage.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/infiniband/hw/mthca/mthca_provider.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index 5b71d43bd89c..42dde06fdb91 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -695,6 +695,7 @@ static struct ib_cq *mthca_create_cq(struct ib_device *ibdev, int entries,
 
 	if (context && ib_copy_to_udata(udata, &cq->cqn, sizeof (__u32))) {
 		mthca_free_cq(to_mdev(ibdev), cq);
+		err = -EFAULT;
 		goto err_free;
 	}
 
-- 
1.9.3

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