From 2b2351148bd740c48c9172d8e1bd9fb2615a10e7 Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Sun, 19 Mar 2023 21:36:36 -0700 Subject: [PATCH] Input: focaltech - use explicitly signed char type 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: 227922b9b809 ("kbuild: treat char as always unsigned") Signed-off-by: Jason A. Donenfeld Reviewed-by: Hans de Goede Cc: stable@vger.kernel.org Link: https://bugzilla.kernel.org/show_bug.cgi?id=217211 Link: https://lore.kernel.org/r/20230318133010.1285202-1-Jason@zx2c4.com Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/mouse/focaltech.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/input/mouse/focaltech.c b/drivers/input/mouse/focaltech.c index 6fd5fff0cbfff..c74b99077d16a 100644 --- a/drivers/input/mouse/focaltech.c +++ b/drivers/input/mouse/focaltech.c @@ -202,8 +202,8 @@ static void focaltech_process_rel_packet(struct psmouse *psmouse, 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); @@ -218,8 +218,8 @@ static void focaltech_process_rel_packet(struct psmouse *psmouse, */ 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]; } } -- 2.39.5