FAILED: patch "[PATCH] thermal: gov_power_allocator: Return early in manage if" failed to apply to 6.9-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.9.y
git checkout FETCH_HEAD
git cherry-pick -x aaa18ff54b97706b84306b6613630262706b1f6b
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024071517-deepen-remedial-db3b@gregkh' --subject-prefix 'PATCH 6.9.y' HEAD^..

Possible dependencies:

aaa18ff54b97 ("thermal: gov_power_allocator: Return early in manage if trip_max is NULL")
ca0e9728d372 ("thermal: gov_power_allocator: Eliminate a redundant variable")
41ddbcc6fd2c ("thermal: gov_power_allocator: Use .manage() callback instead of .throttle()")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From aaa18ff54b97706b84306b6613630262706b1f6b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?N=C3=ADcolas=20F=2E=20R=2E=20A=2E=20Prado?=
 <nfraprado@collabora.com>
Date: Tue, 2 Jul 2024 17:24:56 -0400
Subject: [PATCH] thermal: gov_power_allocator: Return early in manage if
 trip_max is NULL
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Commit da781936e7c3 ("thermal: gov_power_allocator: Allow binding
without trip points") allowed the governor to bind even when trip_max
is NULL. This allows a NULL pointer dereference to happen in the manage
callback.

Add an early return to prevent it, since the governor is expected to not do
anything in this case.

Fixes: da781936e7c3 ("thermal: gov_power_allocator: Allow binding without trip points")
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://patch.msgid.link/20240702-power-allocator-null-trip-max-v1-1-47a60dc55414@collabora.com
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/thermal/gov_power_allocator.c b/drivers/thermal/gov_power_allocator.c
index 45f04a25255a..1b2345a697c5 100644
--- a/drivers/thermal/gov_power_allocator.c
+++ b/drivers/thermal/gov_power_allocator.c
@@ -759,6 +759,9 @@ static void power_allocator_manage(struct thermal_zone_device *tz)
 		return;
 	}
 
+	if (!params->trip_max)
+		return;
+
 	allocate_power(tz, params->trip_max->temperature);
 	params->update_cdevs = true;
 }