linux-kernel - [PATCH review for 4.4 21/47] drm/amdkfd: fix improper return value on error

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Message-ID: <20170920044445.7392-21-alexander.levin@verizon.com>
Date:   Wed, 20 Sep 2017 04:45:04 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Pan Bian <bianpan2016@....com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
Subject: [PATCH review for 4.4 21/47] drm/amdkfd: fix improper return value on
 error

From: Pan Bian <bianpan2016@....com>

[ Upstream commit 8bf793883da213864efc50c274d2b38ec0ca58b2 ]

In function kfd_wait_on_events(), when the call to copy_from_user()
fails, the value of return variable ret is 0. 0 indicates success, which
is inconsistent with the execution status. This patch fixes the bug by
assigning "-EFAULT" to ret when copy_from_user() returns an unexpected
value.

Signed-off-by: Pan Bian <bianpan2016@....com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_events.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index b6e28dcaea1d..1fb1daa0b366 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -739,8 +739,10 @@ int kfd_wait_on_events(struct kfd_process *p,
 		struct kfd_event_data event_data;
 
 		if (copy_from_user(&event_data, &events[i],
-				sizeof(struct kfd_event_data)))
+				sizeof(struct kfd_event_data))) {
+			ret = -EFAULT;
 			goto fail;
+		}
 
 		ret = init_event_waiter(p, &event_waiters[i],
 				event_data.event_id, i);
-- 
2.11.0