From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 199055683 for ; Mon, 3 Apr 2023 14:13:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 95115C433EF; Mon, 3 Apr 2023 14:13:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1680531191; bh=zjEk9E6e7qe1JmkTXMOwfLHd9Pot19JP8A+Cy+lz/Eo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hwy4brekZgpA5mHKTP5wvT1OZ589LzBpHCMZ1Mtm1S8PhATHEqZ+uJRjUrMF4KbkM ZmeAe7UUtikwLhp8ZQ1NvywQZMxPuThqbvRxPP24QUAhhW61iDPQQeau27SH6d8kRn tJozYmDw1HWkzPmtZXIhua7HXB91q49OEm33v+KQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Jason A. Donenfeld" , Hans de Goede , Dmitry Torokhov Subject: [PATCH 4.14 55/66] Input: focaltech - use explicitly signed char type Date: Mon, 3 Apr 2023 16:09:03 +0200 Message-Id: <20230403140353.728767819@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230403140351.636471867@linuxfoundation.org> References: <20230403140351.636471867@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jason A. Donenfeld 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 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(-) --- 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]; } }