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wifi: at76c50x: fix use after free access in at76_disconnect

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[ Upstream commit 27c7e63b3c ]

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: 29e20aa6c6 ("at76c50x-usb: fix use after free on failure path in at76_probe()")
Signed-off-by: Abdun Nihaal <abdun.nihaal@gmail.com>
Link: https://patch.msgid.link/20250330103110.44080-1-abdun.nihaal@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Abdun Nihaal
2025-03-30 16:01:10 +05:30
committed by Greg Kroah-Hartman
parent 00999e369e
commit 3c619aec1f
1 changed files with 1 additions and 1 deletions
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drivers/net/wireless/atmel/at76c50x-usb.c
+1 -1
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@@ -2553,7 +2553,7 @@ 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");
}