linux-kernel - [PATCH AUTOSEL 4.19 026/123] s390/cio: Fix cleanup when unsupported IDA format is used

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Message-Id: <20181205093555.5386-26-sashal@kernel.org>
Date:   Wed,  5 Dec 2018 04:34:18 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Eric Farman <farman@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Sasha Levin <sashal@...nel.org>, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 026/123] s390/cio: Fix cleanup when unsupported IDA format is used

From: Eric Farman <farman@...ux.ibm.com>

[ Upstream commit b89e242eee8d4cd8261d8d821c62c5d1efc454d0 ]

Direct returns from within a loop are rude, but it doesn't mean it gets
to avoid releasing the memory acquired beforehand.

Signed-off-by: Eric Farman <farman@...ux.ibm.com>
Message-Id: <20181109023937.96105-3-farman@...ux.ibm.com>
Reviewed-by: Farhan Ali <alifm@...ux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@...ux.ibm.com>
Acked-by: Halil Pasic <pasic@...ux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/s390/cio/vfio_ccw_cp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
index ef5ab45d94b3..70a006ba4d05 100644
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/drivers/s390/cio/vfio_ccw_cp.c
@@ -387,8 +387,10 @@ static int ccwchain_calc_length(u64 iova, struct channel_program *cp)
 		 * orb specified one of the unsupported formats, we defer
 		 * checking for IDAWs in unsupported formats to here.
 		 */
-		if ((!cp->orb.cmd.c64 || cp->orb.cmd.i2k) && ccw_is_idal(ccw))
+		if ((!cp->orb.cmd.c64 || cp->orb.cmd.i2k) && ccw_is_idal(ccw)) {
+			kfree(p);
 			return -EOPNOTSUPP;
+		}
 
 		if ((!ccw_is_chain(ccw)) && (!ccw_is_tic(ccw)))
 			break;
-- 
2.17.1