linux-kernel - [PATCH 3.2 71/94] IB/ehca: Returns an error on ib_copy_to

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Message-ID: <lsq.1398647482.320597291@decadent.org.uk>
Date:	Mon, 28 Apr 2014 02:11:22 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Roland Dreier" <roland@...estorage.com>,
	"Yann Droneaud" <ydroneaud@...eya.com>
Subject: [PATCH 3.2 71/94] IB/ehca: Returns an error on ib_copy_to_udata()
 failure

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

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

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

commit 5bdb0f02add5994b0bc17494f4726925ca5d6ba1 upstream.

In case of error when writing to userspace, function ehca_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: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/infiniband/hw/ehca/ehca_cq.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/infiniband/hw/ehca/ehca_cq.c
+++ b/drivers/infiniband/hw/ehca/ehca_cq.c
@@ -296,6 +296,7 @@ struct ib_cq *ehca_create_cq(struct ib_d
 			(my_cq->galpas.user.fw_handle & (PAGE_SIZE - 1));
 		if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
 			ehca_err(device, "Copy to udata failed.");
+			cq = ERR_PTR(-EFAULT);
 			goto create_cq_exit4;
 		}
 	}

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