From patchwork Fri May 17 14:19:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikita Zhandarovich X-Patchwork-Id: 13667050 X-Patchwork-Delegate: jikos@jikos.cz Received: from exchange.fintech.ru (exchange.fintech.ru [195.54.195.159]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EA8C054F95; Fri, 17 May 2024 14:19:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=195.54.195.159 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715955575; cv=none; b=jSOLwyviHtmC+7ShF4m1spPBOh1QxKWFjGjiQ8bLvW3m8nqT9MG148f1XNPUWAFAbnMwJqdpORpM5xahJ8Myv0jyR/MzRlomndbPB5tsrTzbQD99CQnWYUUL6rTju9uful7oGMoDW4Rwo+uSDli6jdunPXXr6szpYJto2iGyfCM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715955575; c=relaxed/simple; bh=0Z19W0lYssVtBpmc2IGLBgu9eupgPGN+qoB0RUqW9UU=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=tYzdaW3pJ4ycA1MqGU5nH5JNbiwqFvZJhUNLowNm5B3O2T3ICCBYMTzWSyn/HCg1Vta6vRQlgchFzsT/+DTP79YozsKdG0Qur5ujJuapxOo9Il/Et0ZmNzvXODngVyVneKLnz4Z7ZbuAKpWkZnrwK5RymYyLeyElHH/swgLReKg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fintech.ru; spf=pass smtp.mailfrom=fintech.ru; arc=none smtp.client-ip=195.54.195.159 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=fintech.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=fintech.ru Received: from Ex16-01.fintech.ru (10.0.10.18) by exchange.fintech.ru (195.54.195.169) with Microsoft SMTP Server (TLS) id 14.3.498.0; Fri, 17 May 2024 17:19:20 +0300 Received: from localhost (10.0.253.138) by Ex16-01.fintech.ru (10.0.10.18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4; Fri, 17 May 2024 17:19:20 +0300 From: Nikita Zhandarovich To: Jiri Kosina CC: Nikita Zhandarovich , Benjamin Tissoires , Dmitry Torokhov , "Douglas Anderson" , , , Alan Stern , Subject: [PATCH] HID: core: remove unnecessary WARN_ON() in implement() Date: Fri, 17 May 2024 07:19:14 -0700 Message-ID: <20240517141914.8604-1-n.zhandarovich@fintech.ru> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: Ex16-02.fintech.ru (10.0.10.19) To Ex16-01.fintech.ru (10.0.10.18) Syzkaller hit a warning [1] in a call to implement() when trying to write a value into a field of smaller size in an output report. Since implement() already has a warn message printed out with the help of hid_warn() and value in question gets trimmed with: ... value &= m; ... WARN_ON may be considered superfluous. Remove it to suppress future syzkaller triggers. [1] WARNING: CPU: 0 PID: 5084 at drivers/hid/hid-core.c:1451 implement drivers/hid/hid-core.c:1451 [inline] WARNING: CPU: 0 PID: 5084 at drivers/hid/hid-core.c:1451 hid_output_report+0x548/0x760 drivers/hid/hid-core.c:1863 Modules linked in: CPU: 0 PID: 5084 Comm: syz-executor424 Not tainted 6.9.0-rc7-syzkaller-00183-gcf87f46fd34d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:implement drivers/hid/hid-core.c:1451 [inline] RIP: 0010:hid_output_report+0x548/0x760 drivers/hid/hid-core.c:1863 ... Call Trace: __usbhid_submit_report drivers/hid/usbhid/hid-core.c:591 [inline] usbhid_submit_report+0x43d/0x9e0 drivers/hid/usbhid/hid-core.c:636 hiddev_ioctl+0x138b/0x1f00 drivers/hid/usbhid/hiddev.c:726 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f ... Fixes: 95d1c8951e5b ("HID: simplify implement() a bit") Reported-by: syzbot+5186630949e3c55f0799@syzkaller.appspotmail.com Signed-off-by: Nikita Zhandarovich --- drivers/hid/hid-core.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index b1fa0378e8f4..74efda212c55 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1448,7 +1448,6 @@ static void implement(const struct hid_device *hid, u8 *report, hid_warn(hid, "%s() called with too large value %d (n: %d)! (%s)\n", __func__, value, n, current->comm); - WARN_ON(1); value &= m; } }