Patch "drm/nouveau/mem: guard against NULL pointer access in mem_del" has been added to the 4.19-stable tree

Patch "drm/nouveau/mem: guard against NULL pointer access in mem_del" has been added to the 4.19-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/nouveau/mem: guard against NULL pointer access in mem_del

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-nouveau-mem-guard-against-null-pointer-access-in-mem_del.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From d10285a25e29f13353bbf7760be8980048c1ef2f Mon Sep 17 00:00:00 2001
From: Karol Herbst <kherbst@redhat.com>
Date: Wed, 7 Oct 2020 00:05:28 +0200
Subject: drm/nouveau/mem: guard against NULL pointer access in mem_del

From: Karol Herbst <kherbst@redhat.com>

commit d10285a25e29f13353bbf7760be8980048c1ef2f upstream.

other drivers seems to do something similar

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Cc: dri-devel <dri-devel@lists.freedesktop.org>
Cc: Dave Airlie <airlied@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201006220528.13925-2-kherbst@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/nouveau/nouveau_mem.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/nouveau/nouveau_mem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_mem.c
@@ -176,6 +176,8 @@ void
 nouveau_mem_del(struct ttm_mem_reg *reg)
 {
 	struct nouveau_mem *mem = nouveau_mem(reg);
+	if (!mem)
+		return;
 	nouveau_mem_fini(mem);
 	kfree(reg->mm_node);
 	reg->mm_node = NULL;


Patches currently in stable-queue which might be from kherbst@redhat.com are

queue-4.19/drm-nouveau-mem-guard-against-null-pointer-access-in-mem_del.patch
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