This is a note to let you know that I've just added the patch titled
drm/i915: Check before removing mm notifier
to the 6.6-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-i915-check-before-removing-mm-notifier.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 01bb1ae35006e473138c90711bad1a6b614a1823 Mon Sep 17 00:00:00 2001
From: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Date: Mon, 19 Feb 2024 13:50:47 +0100
Subject: drm/i915: Check before removing mm notifier
From: Nirmoy Das <nirmoy.das@xxxxxxxxx>
commit 01bb1ae35006e473138c90711bad1a6b614a1823 upstream.
Error in mmu_interval_notifier_insert() can leave a NULL
notifier.mm pointer. Catch that and return early.
Fixes: ed29c2691188 ("drm/i915: Fix userptr so we do not have to worry about obj->mm.lock, v7.")
Cc: <stable@xxxxxxxxxxxxxxx> # v5.13+
[tursulin: Added Fixes and cc stable.]
Cc: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Cc: Shawn Lee <shawn.c.lee@xxxxxxxxx>
Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240219125047.28906-1-nirmoy.das@xxxxxxxxx
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
(cherry picked from commit db7bbd13f08774cde0332c705f042e327fe21e73)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -379,6 +379,9 @@ i915_gem_userptr_release(struct drm_i915
{
GEM_WARN_ON(obj->userptr.page_ref);
+ if (!obj->userptr.notifier.mm)
+ return;
+
mmu_interval_notifier_remove(&obj->userptr.notifier);
obj->userptr.notifier.mm = NULL;
}
Patches currently in stable-queue which might be from nirmoy.das@xxxxxxxxx are
queue-6.6/drm-i915-check-before-removing-mm-notifier.patch
