From: Abdun Nihaal Date: Sun, 30 Mar 2025 10:31:10 +0000 (+0530) Subject: wifi: at76c50x: fix use after free access in at76_disconnect X-Git-Tag: v5.4.293~96 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c731cdfddcf1be1590d5ba8c9b508f98e3a2b3d6;p=thirdparty%2Fkernel%2Fstable.git wifi: at76c50x: fix use after free access in at76_disconnect [ Upstream commit 27c7e63b3cb1a20bb78ed4a36c561ea4579fd7da ] The memory pointed to by priv is freed at the end of at76_delete_device function (using ieee80211_free_hw). But the code then accesses the udev field of the freed object to put the USB device. This may also lead to a memory leak of the usb device. Fix this by using udev from interface. Fixes: 29e20aa6c6af ("at76c50x-usb: fix use after free on failure path in at76_probe()") Signed-off-by: Abdun Nihaal Link: https://patch.msgid.link/20250330103110.44080-1-abdun.nihaal@gmail.com Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- diff --git a/drivers/net/wireless/atmel/at76c50x-usb.c b/drivers/net/wireless/atmel/at76c50x-usb.c index db2c3b8d491e5..c9ee3d4c8fa61 100644 --- a/drivers/net/wireless/atmel/at76c50x-usb.c +++ b/drivers/net/wireless/atmel/at76c50x-usb.c @@ -2554,7 +2554,7 @@ static void at76_disconnect(struct usb_interface *interface) wiphy_info(priv->hw->wiphy, "disconnecting\n"); at76_delete_device(priv); - usb_put_dev(priv->udev); + usb_put_dev(interface_to_usbdev(interface)); dev_info(&interface->dev, "disconnected\n"); }