linux-kernel - [PATCH 4.9 175/310] drm/amdkfd: NULL dereference involving create

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Message-Id: <20180411183630.157793909@linuxfoundation.org>
Date:   Wed, 11 Apr 2018 20:35:14 +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, Dan Carpenter <dan.carpenter@...cle.com>,
        Felix Kuehling <felix.kuehling@....com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 175/310] drm/amdkfd: NULL dereference involving create_process()

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

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

From: Dan Carpenter <dan.carpenter@...cle.com>


[ Upstream commit b312b2b25b6ac9e2eb03f4ca651b33108752de3a ]

We accidentally return ERR_PTR(0) which is NULL.  The caller is not
expecting that and it leads to an Oops.

Fixes: dd59239a9862 ("amdkfd: init aperture once per process")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Felix Kuehling <felix.kuehling@....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 |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -317,7 +317,8 @@ static struct kfd_process *create_proces
 
 	/* init process apertures*/
 	process->is_32bit_user_mode = in_compat_syscall();
-	if (kfd_init_apertures(process) != 0)
+	err = kfd_init_apertures(process);
+	if (err != 0)
 		goto err_init_apretures;
 
 	return process;