linux-hardening - [PATCH][next] usb: atm: Use struct

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20210928233935.GA299525@embeddedor>
Date:   Tue, 28 Sep 2021 18:39:35 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Duncan Sands <duncan.sands@...e.fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] usb: atm: Use struct_size() helper

Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worse scenario, could lead to heap overflows.

Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/usb/atm/usbatm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/atm/usbatm.c b/drivers/usb/atm/usbatm.c
index 33ae03ac13a6..da17be1ef64e 100644
--- a/drivers/usb/atm/usbatm.c
+++ b/drivers/usb/atm/usbatm.c
@@ -1015,9 +1015,11 @@ int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
 	int error = -ENOMEM;
 	int i, length;
 	unsigned int maxpacket, num_packets;
+	size_t size;
 
 	/* instance init */
-	instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
+	size = struct_size(instance, urbs, num_rcv_urbs + num_snd_urbs);
+	instance = kzalloc(size, GFP_KERNEL);
 	if (!instance)
 		return -ENOMEM;
 
-- 
2.27.0