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most: usb: Fix use-after-free in hdm_disconnect

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commit 4b12709026 upstream.

hdm_disconnect() calls most_deregister_interface(), which eventually
unregisters the MOST interface device with device_unregister(iface->dev).
If that drops the last reference, the device core may call release_mdev()
immediately while hdm_disconnect() is still executing.

The old code also freed several mdev-owned allocations in
hdm_disconnect() and then performed additional put_device() calls.
Depending on refcount order, this could lead to use-after-free or
double-free when release_mdev() ran (or when unregister paths also
performed puts).

Fix by moving the frees of mdev-owned allocations into release_mdev(),
so they happen exactly once when the device is truly released, and by
dropping the extra put_device() calls in hdm_disconnect() that are
redundant after device_unregister() and most_deregister_interface().

This addresses the KASAN slab-use-after-free reported by syzbot in
hdm_disconnect(). See report and stack traces in the bug link below.

Reported-by: syzbot+916742d5d24f6c254761@syzkaller.appspotmail.com
Cc: stable <stable@kernel.org>
Closes: https://syzkaller.appspot.com/bug?extid=916742d5d24f6c254761
Fixes: 97a6f772f3 ("drivers: most: add USB adapter driver")
Signed-off-by: Victoria Votokina <Victoria.Votokina@kaspersky.com>
Link: https://patch.msgid.link/20251010105241.4087114-2-Victoria.Votokina@kaspersky.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Victoria Votokina
2025-10-29 14:07:05 +01:00
committed by Greg Kroah-Hartman
parent 9a297a68c3
commit 72427dc6f8
1 changed files with 4 additions and 7 deletions
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drivers/most/most_usb.c
+4 -7
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@@ -929,6 +929,10 @@ static void release_mdev(struct device *dev)
{
struct most_dev *mdev = to_mdev_from_dev(dev);
kfree(mdev->busy_urbs);
kfree(mdev->cap);
kfree(mdev->conf);
kfree(mdev->ep_address);
kfree(mdev);
}
/**
@@ -1121,13 +1125,6 @@ static void hdm_disconnect(struct usb_interface *interface)
if (mdev->dci)
device_unregister(&mdev->dci->dev);
most_deregister_interface(&mdev->iface);
kfree(mdev->busy_urbs);
kfree(mdev->cap);
kfree(mdev->conf);
kfree(mdev->ep_address);
put_device(&mdev->dci->dev);
put_device(&mdev->dev);
}
static int hdm_suspend(struct usb_interface *interface, pm_message_t message)