Patch "Input: psmouse - fix OOB access in Elantech protocol" has been added to the 6.1-stable tree

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

    Input: psmouse - fix OOB access in Elantech protocol

to the 6.1-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:
     input-psmouse-fix-oob-access-in-elantech-protocol.patch
and it can be found in the queue-6.1 subdirectory.

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


>From 7b63a88bb62ba2ddf5fcd956be85fe46624628b9 Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Date: Thu, 11 May 2023 12:08:37 -0700
Subject: Input: psmouse - fix OOB access in Elantech protocol

From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>

commit 7b63a88bb62ba2ddf5fcd956be85fe46624628b9 upstream.

The kernel only allocate 5 MT slots; check that transmitted slot ID
falls within the acceptable range.

Link: https://lore.kernel.org/r/ZFnEL91nrT789dbG@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/input/mouse/elantech.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -674,10 +674,11 @@ static void process_packet_head_v4(struc
 	struct input_dev *dev = psmouse->dev;
 	struct elantech_data *etd = psmouse->private;
 	unsigned char *packet = psmouse->packet;
-	int id = ((packet[3] & 0xe0) >> 5) - 1;
+	int id;
 	int pres, traces;
 
-	if (id < 0)
+	id = ((packet[3] & 0xe0) >> 5) - 1;
+	if (id < 0 || id >= ETP_MAX_FINGERS)
 		return;
 
 	etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
@@ -707,7 +708,7 @@ static void process_packet_motion_v4(str
 	int id, sid;
 
 	id = ((packet[0] & 0xe0) >> 5) - 1;
-	if (id < 0)
+	if (id < 0 || id >= ETP_MAX_FINGERS)
 		return;
 
 	sid = ((packet[3] & 0xe0) >> 5) - 1;
@@ -728,7 +729,7 @@ static void process_packet_motion_v4(str
 	input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
 	input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
 
-	if (sid >= 0) {
+	if (sid >= 0 && sid < ETP_MAX_FINGERS) {
 		etd->mt[sid].x += delta_x2 * weight;
 		etd->mt[sid].y -= delta_y2 * weight;
 		input_mt_slot(dev, sid);


Patches currently in stable-queue which might be from dmitry.torokhov@xxxxxxxxx are

queue-6.1/input-fix-open-count-when-closing-inhibited-device.patch
queue-6.1/input-psmouse-fix-oob-access-in-elantech-protocol.patch
queue-6.1/input-xpad-delete-a-razer-deathadder-mouse-vid-pid-entry.patch



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