This is a note to let you know that I've just added the patch titled
Input: focaltech - use explicitly signed char type
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:
input-focaltech-use-explicitly-signed-char-type.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@xxxxxxxxxxxxxxx> know about it.
>From 8980f190947ba29f23110408e712444884b74251 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Date: Sun, 19 Mar 2023 21:36:36 -0700
Subject: Input: focaltech - use explicitly signed char type
From: Jason A. Donenfeld <Jason@xxxxxxxxx>
commit 8980f190947ba29f23110408e712444884b74251 upstream.
The recent change of -funsigned-char causes additions of negative
numbers to become additions of large positive numbers, leading to wrong
calculations of mouse movement. Change these casts to be explicitly
signed, to take into account negative offsets.
Fixes: 3bc753c06dd0 ("kbuild: treat char as always unsigned")
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217211
Link: https://lore.kernel.org/r/20230318133010.1285202-1-Jason@xxxxxxxxx
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/input/mouse/focaltech.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/input/mouse/focaltech.c
+++ b/drivers/input/mouse/focaltech.c
@@ -206,8 +206,8 @@ static void focaltech_process_rel_packet
state->pressed = packet[0] >> 7;
finger1 = ((packet[0] >> 4) & 0x7) - 1;
if (finger1 < FOC_MAX_FINGERS) {
- state->fingers[finger1].x += (char)packet[1];
- state->fingers[finger1].y += (char)packet[2];
+ state->fingers[finger1].x += (s8)packet[1];
+ state->fingers[finger1].y += (s8)packet[2];
} else {
psmouse_err(psmouse, "First finger in rel packet invalid: %d\n",
finger1);
@@ -222,8 +222,8 @@ static void focaltech_process_rel_packet
*/
finger2 = ((packet[3] >> 4) & 0x7) - 1;
if (finger2 < FOC_MAX_FINGERS) {
- state->fingers[finger2].x += (char)packet[4];
- state->fingers[finger2].y += (char)packet[5];
+ state->fingers[finger2].x += (s8)packet[4];
+ state->fingers[finger2].y += (s8)packet[5];
}
}
Patches currently in stable-queue which might be from Jason@xxxxxxxxx are
queue-4.19/input-focaltech-use-explicitly-signed-char-type.patch
