Commit e4a7f9ce authored Jan 04, 2022 by Pavel Skripkin Committed by Greg Kroah-Hartman Jan 11, 2022

ieee802154: atusb: fix uninit value in atusb_set_extended_addr

commit 754e4382354f7908923a1949d8dc8d05f82f09cb upstream.

Alexander reported a use of uninitialized value in
atusb_set_extended_addr(), that is caused by reading 0 bytes via
usb_control_msg().

Fix it by validating if the number of bytes transferred is actually
correct, since usb_control_msg() may read less bytes, than was requested
by caller.

Fail log:

BUG: KASAN: uninit-cmp in ieee802154_is_valid_extended_unicast_addr include/linux/ieee802154.h:310 [inline]
BUG: KASAN: uninit-cmp in atusb_set_extended_addr drivers/net/ieee802154/atusb.c:1000 [inline]
BUG: KASAN: uninit-cmp in atusb_probe.cold+0x29f/0x14db drivers/net/ieee802154/atusb.c:1056
Uninit value used in comparison: 311daa649a2003bd stack handle: 000000009a2003bd
ieee802154_is_valid_extended_unicast_addr include/linux/ieee802154.h:310 [inline]
atusb_set_extended_addr drivers/net/ieee802154/atusb.c:1000 [inline]
atusb_probe.cold+0x29f/0x14db drivers/net/ieee802154/atusb.c:1056
usb_probe_interface+0x314/0x7f0 drivers/usb/core/driver.c:396

Fixes: 7490b008 ("ieee802154: add support for atusb transceiver")
Reported-by: Alexander Potapenko <glider@google.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: https://lore.kernel.org/r/20220104182806.7188-1-paskripkin@gmail.com

Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent aa8b23dd

drivers/net/ieee802154/atusb.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -77,7 +77,9 @@ static int atusb_control_msg(struct atusb *atusb, unsigned int pipe,

		ret = usb_control_msg(usb_dev, pipe, request, requesttype,
		value, index, data, size, timeout);
		if (ret < 0) {
		if (ret < size) {
		ret = ret < 0 ? ret : -ENODATA;

		atusb->err = ret;
		dev_err(&usb_dev->dev,
		"atusb_control_msg: req 0x%02x val 0x%x idx 0x%x, error %d\n",
		@@ -567,9 +569,9 @@ static int atusb_get_and_show_build(struct atusb *atusb)
		if (!build)
		return -ENOMEM;

		ret = atusb_control_msg(atusb, usb_rcvctrlpipe(usb_dev, 0),
		ATUSB_BUILD, ATUSB_REQ_FROM_DEV, 0, 0,
		build, ATUSB_BUILD_SIZE, 1000);
		/* We cannot call atusb_control_msg() here, since this request may read various length data */
		ret = usb_control_msg(atusb->usb_dev, usb_rcvctrlpipe(usb_dev, 0), ATUSB_BUILD,
		ATUSB_REQ_FROM_DEV, 0, 0, build, ATUSB_BUILD_SIZE, 1000);
		if (ret >= 0) {
		build[ret] = 0;
		dev_info(&usb_dev->dev, "Firmware: build %s\n", build);