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 DA9A222AE68; Tue, 29 Apr 2025 17:49:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745948962; cv=none; b=cBdy6iq+y9/0R8LK+J+jJfBRag1G9E92Try+Tj6djg936p9Qv03NTM4KjvJ/H68Kb5cR6ufAq94QoQ6D/XLNUt6P6CnRn33SCd160Sv7nBceXDudH/I0tOfQAHYq2rnxg+CaktXOiniUdvULWqNS13NDRhr0uWiiuPbylcCx98Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745948962; c=relaxed/simple; bh=M1dhoYId87+ooVsspV94y9jI2+x2kQBnKEWXH5ksHwA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=RUD3d3rJqO8Sv4oPty/h200nAcZgc9xVNSxtRZcMnKaXl9cRM/oDQ5yp4WYjps6W275RWesVWKQXRKAMXka8TGqwhkMO4jLEqOJqF+7pPYQGjc+oeoM7C85EkNYBfbeqmUrWIu3BIZV/uCz44RpRBZ7Ohhehtx/fVAEzNJIP5hI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=b3gJvUpC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="b3gJvUpC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 55783C4CEE3; Tue, 29 Apr 2025 17:49:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745948962; bh=M1dhoYId87+ooVsspV94y9jI2+x2kQBnKEWXH5ksHwA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=b3gJvUpCjoI6FA9+DNh/Db0vmVGHcwKcXm6+3C84qYYKYgzrSDm5mBrFxieKuQ452 z9L9Pr/ljM5Z5irciCoU3QZXX04L8C0MQ7erjyzTDTIw8RlUtDARaBofnaivub3QxC PqvV/SaKCT5Zk1CgnwJRkxIzz/HHi1/IYbLqBaxI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Nikita Zhandarovich , Alex Lanzano Subject: [PATCH 5.15 177/373] drm/repaper: fix integer overflows in repeat functions Date: Tue, 29 Apr 2025 18:40:54 +0200 Message-ID: <20250429161130.451250351@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250429161123.119104857@linuxfoundation.org> References: <20250429161123.119104857@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nikita Zhandarovich commit 4d098000ac193f359e6b8ca4801dbdbd6a27b41f upstream. There are conditions, albeit somewhat unlikely, under which right hand expressions, calculating the end of time period in functions like repaper_frame_fixed_repeat(), may overflow. For instance, if 'factor10x' in repaper_get_temperature() is high enough (170), as is 'epd->stage_time' in repaper_probe(), then the resulting value of 'end' will not fit in unsigned int expression. Mitigate this by casting 'epd->factored_stage_time' to wider type before any multiplication is done. Found by Linux Verification Center (linuxtesting.org) with static analysis tool SVACE. Fixes: 3589211e9b03 ("drm/tinydrm: Add RePaper e-ink driver") Cc: stable@vger.kernel.org Signed-off-by: Nikita Zhandarovich Signed-off-by: Alex Lanzano Link: https://patchwork.freedesktop.org/patch/msgid/20250116134801.22067-1-n.zhandarovich@fintech.ru Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/tiny/repaper.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/tiny/repaper.c +++ b/drivers/gpu/drm/tiny/repaper.c @@ -454,7 +454,7 @@ static void repaper_frame_fixed_repeat(s enum repaper_stage stage) { u64 start = local_clock(); - u64 end = start + (epd->factored_stage_time * 1000 * 1000); + u64 end = start + ((u64)epd->factored_stage_time * 1000 * 1000); do { repaper_frame_fixed(epd, fixed_value, stage); @@ -465,7 +465,7 @@ static void repaper_frame_data_repeat(st const u8 *mask, enum repaper_stage stage) { u64 start = local_clock(); - u64 end = start + (epd->factored_stage_time * 1000 * 1000); + u64 end = start + ((u64)epd->factored_stage_time * 1000 * 1000); do { repaper_frame_data(epd, image, mask, stage);