[BUG, regression] Dereferencing of NULL pointer in radeon_mn_unregister()

[Jason Gunthorpe]

On Sun, Sep 01, 2019 at 05:48:36PM +0200, Petr Cvek wrote:
> > Is just adding a
> > 
> >   if (!rmn)
> >        retrun
> > 
> > To the top of radeon_mn_unregister enough to fix it?
> 
> Yeah it seems to work. A further test with minetest works too.

Okay, I added this patch to the hmm tree, thanks.

>From 829394d77e3026e08e7879fb37f14c90de7b0fd8 Mon Sep 17 00:00:00 2001
From: Jason Gunthorpe <jgg at mellanox.com>
Date: Mon, 2 Sep 2019 03:01:03 -0300
Subject: [PATCH] drm/radeon: guard against calling an unpaired
 radeon_mn_unregister()

This check was accidently deleted in the below commit. There are cases
where the driver will call unregister even though it hasn't registered
anything.

 CPU 0 Unable to handle kernel paging request at virtual address 0000001c, epc == 808de6d4, ra == 804d32ec
 Call Trace:
 [<808de6d4>] mutex_lock+0x8/0x44
 [<804d32ec>] radeon_mn_unregister+0x3c/0xb0
 [<8041583c>] radeon_gem_object_free+0x18/0x2c
 [<803a451c>] drm_gem_object_release_handle+0x74/0xac
 [<803a45d0>] drm_gem_handle_delete+0x7c/0x128
 [<803a5bf4>] drm_ioctl_kernel+0xb0/0x108
 [<803a5e74>] drm_ioctl+0x200/0x3a8
 [<803e07b4>] radeon_drm_ioctl+0x54/0xc0
 [<801214dc>] do_vfs_ioctl+0x4e8/0x81c
 [<80121864>] ksys_ioctl+0x54/0xb0
 [<8001100c>] syscall_common+0x34/0x58

Link: https://lore.kernel.org/r/2fc7ef14-e89a-1f2d-381d-1c9b05da02d3@gmail.com
Fixes: 534e5f84b7a9 ("drm/radeon: use mmu_notifier_get/put for struct radeon_mn")
Reported-by: Petr Cvek <petrcvekcz at gmail.com>
Signed-off-by: Jason Gunthorpe <jgg at mellanox.com>
---
 drivers/gpu/drm/radeon/radeon_mn.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c
index fc8254273a800b..1ee20d528a7c24 100644
--- a/drivers/gpu/drm/radeon/radeon_mn.c
+++ b/drivers/gpu/drm/radeon/radeon_mn.c
@@ -234,6 +234,9 @@ void radeon_mn_unregister(struct radeon_bo *bo)
 	struct radeon_mn *rmn = bo->mn;
 	struct list_head *head;
 
+	if (!rmn)
+		return;
+
 	mutex_lock(&rmn->lock);
 	/* save the next list entry for later */
 	head = bo->mn_list.next;
-- 
2.23.0