This is a note to let you know that I've just added the patch titled
usbtmc: more sanity checking for packet size
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From de7b9aa633b693e77942e12f1769506efae6917b Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@xxxxxxxx>
Date: Tue, 20 Aug 2019 11:28:25 +0200
Subject: usbtmc: more sanity checking for packet size
A malicious device can make the driver divide ny zero
with a nonsense maximum packet size.
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20190820092826.17694-1-oneukum@xxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/class/usbtmc.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 4942122b2346..36858ddd8d9b 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -2362,8 +2362,11 @@ static int usbtmc_probe(struct usb_interface *intf,
goto err_put;
}
+ retcode = -EINVAL;
data->bulk_in = bulk_in->bEndpointAddress;
data->wMaxPacketSize = usb_endpoint_maxp(bulk_in);
+ if (!data->wMaxPacketSize)
+ goto err_put;
dev_dbg(&intf->dev, "Found bulk in endpoint at %u\n", data->bulk_in);
data->bulk_out = bulk_out->bEndpointAddress;
--
2.23.0
