From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 599CB47B422; Tue, 16 Jun 2026 17:31:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781631095; cv=none; b=Lh86DWF+n4bMLF+W3Fir+y9RQ5nHpf/VzYyKEhM816ACTLSsxZaHGfAxpNt+WrpqD41vogqcrI6d86kwMaPtRqSfPvgdKUauLCC6GIM9Z/z+Inb8MGNdFJdwwO8OhUCwDJrNPaH04un6cgh+1C+ip/iN3aLnDqhhOhQyyacMVtU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781631095; c=relaxed/simple; bh=TvUxwqGNO9UzerTS/wEV0oDvLlBq6wNxuFW3V/5iDMw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=o3ZT+UOi9e6P5WXFqlzwTdtvmsc+UeTdDK4QZKDCUUkw/Ol+x29AvdA3yB8idMN3dpnou1dUWRTSzjFS1ykIdvKkHe9DbvQ7/st1LjAjM5v1nABFbhcaGEBvG1fnpysRwdJVC1DwkBckIjqVdqmLM4D2hjECHCxtiqYqYKmO9a8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ddwk2N0w; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ddwk2N0w" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 12BE01F00A3A; Tue, 16 Jun 2026 17:31:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781631094; bh=PSW77uzTO3uornqDQBFrEiydl70qdFAMMjbK9Ya2YqM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ddwk2N0w3CeFMu8odBNYNQ1bcEYUlgBck2iHqRdhdPHY43TeZk4rRtNlDorGw1aIO ujLW7GbHWytvB4Xmf3S3bGybVLXmo7e6CqNHdgREp28Z8PnF0tsTV+5BkIcwq9NDiY kN4BDcIYW/hnlguA/Oz0WJ3hHgXPngwIDpfMdA/s= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Andrew Lunn , Johan Hovold Subject: [PATCH 6.1 155/522] USB: serial: mxuport: fix memory corruption with small endpoint Date: Tue, 16 Jun 2026 20:25:02 +0530 Message-ID: <20260616145133.355296606@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145125.307082728@linuxfoundation.org> References: <20260616145125.307082728@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 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit 4085f0dbb1ce2251c9a5938d693de6593f0ab2bd upstream. Make sure that the bulk-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption should a malicious device report a smaller size. Fixes: ee467a1f2066 ("USB: serial: add Moxa UPORT 12XX/14XX/16XX driver") Cc: stable@vger.kernel.org # 3.14 Cc: Andrew Lunn Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/mxuport.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/usb/serial/mxuport.c +++ b/drivers/usb/serial/mxuport.c @@ -962,6 +962,14 @@ static int mxuport_calc_num_ports(struct */ BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_out) < 16); + /* + * The bulk-out buffers must be large enough for the four-byte header + * (and following data), but assume anything smaller than eight bytes + * is broken. + */ + if (usb_endpoint_maxp(epds->bulk_out[0]) < 8) + return -EINVAL; + for (i = 1; i < num_ports; ++i) epds->bulk_out[i] = epds->bulk_out[0];