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 83ACE34CFAE; Wed, 3 Dec 2025 16:12:50 +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=1764778370; cv=none; b=FBi/Oe0+YuvrKNbm9bWO/eReN4PoWWUwbjGlHh8fK8oLADnm5PX9EGnGC30H+7aS2ERhqsfntkrQ5oux18ecCBTJeZAy0cmMRLxyhmsvlL1JPIs7nB0aZ5FdV09NdT7zIXoCwnFseMtxUKXWFkET7luCTRJsVMmW6wUeaWwlKhc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764778370; c=relaxed/simple; bh=1IV84oWCihc8Qv7DjrbJ+a3BEkwp+4NWGmuKQTE6yF0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QfaQ9NbGV62bZvT6A3NhWh2RpPZmQQJbrDQEJvmF++C4Ipf25YzJkWMruo+E0Up/5GMIsidIyg5IkeA9IbzKZC8E63WBYr22DVDRN//GT4KIWt/U7S52VdRs0Voo4s17SpSE1/1PzsOJBPf1ueBfm61egzes2s7GgY/nEMKLbOU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=I7ImSaJV; 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="I7ImSaJV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E34AEC4CEF5; Wed, 3 Dec 2025 16:12:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764778370; bh=1IV84oWCihc8Qv7DjrbJ+a3BEkwp+4NWGmuKQTE6yF0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I7ImSaJV8itaC/4iwh8NsCarKwVTLs3Dxd2mAcUZJ48U2VCQ+B41E09H/eRbS1YSg p8EmPI8nm9Bhlh2aLQNBLaCPXPxEuRdxlHbB0CPYCMMhf5+CsE1/omBlwi4h1xnuU6 sK109lmxDVLjXlAJgQ//ENyx3knn3By67BP8QGTk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Seungjin Bae , Dmitry Torokhov , Sasha Levin Subject: [PATCH 5.15 326/392] Input: pegasus-notetaker - fix potential out-of-bounds access Date: Wed, 3 Dec 2025 16:27:56 +0100 Message-ID: <20251203152426.159306899@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251203152414.082328008@linuxfoundation.org> References: <20251203152414.082328008@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev 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: Seungjin Bae [ Upstream commit 69aeb507312306f73495598a055293fa749d454e ] In the pegasus_notetaker driver, the pegasus_probe() function allocates the URB transfer buffer using the wMaxPacketSize value from the endpoint descriptor. An attacker can use a malicious USB descriptor to force the allocation of a very small buffer. Subsequently, if the device sends an interrupt packet with a specific pattern (e.g., where the first byte is 0x80 or 0x42), the pegasus_parse_packet() function parses the packet without checking the allocated buffer size. This leads to an out-of-bounds memory access. Fixes: 1afca2b66aac ("Input: add Pegasus Notetaker tablet driver") Signed-off-by: Seungjin Bae Link: https://lore.kernel.org/r/20251007214131.3737115-2-eeodqql09@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/input/tablet/pegasus_notetaker.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/input/tablet/pegasus_notetaker.c +++ b/drivers/input/tablet/pegasus_notetaker.c @@ -63,6 +63,9 @@ #define BUTTON_PRESSED 0xb5 #define COMMAND_VERSION 0xa9 +/* 1 Status + 1 Color + 2 X + 2 Y = 6 bytes */ +#define NOTETAKER_PACKET_SIZE 6 + /* in xy data packet */ #define BATTERY_NO_REPORT 0x40 #define BATTERY_LOW 0x41 @@ -297,6 +300,12 @@ static int pegasus_probe(struct usb_inte pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress); pegasus->data_len = usb_maxpacket(dev, pipe); + if (pegasus->data_len < NOTETAKER_PACKET_SIZE) { + dev_err(&intf->dev, "packet size is too small (%d)\n", + pegasus->data_len); + error = -EINVAL; + goto err_free_mem; + } pegasus->data = usb_alloc_coherent(dev, pegasus->data_len, GFP_KERNEL, &pegasus->data_dma);