linux-kernel - [PATCH 4.9 095/111] drm/amdkfd: Fix error codes in kfd_get

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Date:   Mon, 24 Sep 2018 13:53:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wei Lu <wei.lu2@....com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Christian König <christian.koenig@....com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 095/111] drm/amdkfd: Fix error codes in kfd_get_process

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

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

From: Wei Lu <wei.lu2@....com>

[ Upstream commit e47cb828eb3fca3e8999a0b9aa053dda18552071 ]

Return ERR_PTR(-EINVAL) if kfd_get_process fails to find the process.
This fixes kernel oopses when a child process calls KFD ioctls with
a file descriptor inherited from the parent process.

Signed-off-by: Wei Lu <wei.lu2@....com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@....com>
Acked-by: Christian König <christian.koenig@....com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/amdkfd/kfd_process.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -124,6 +124,8 @@ struct kfd_process *kfd_get_process(cons
 		return ERR_PTR(-EINVAL);
 
 	process = find_process(thread);
+	if (!process)
+		return ERR_PTR(-EINVAL);
 
 	return process;
 }