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rtl8187: fix use after free on failure path in rtl8187_probe()

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If allocation of io_dmabuf fails, rtl8187_probe() calls usb_put_dev(udev)
while usb_get_dev(udev) is not called yet. As a result refcnt is decremented
incorrectly and usb_dev can be used after memory deallocation.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Alexey Khoroshilov 2014-03-29 00:26:15 +04:00 committed by John W. Linville
parent 6cea5f2173
commit a31267c308
1 changed files with 2 additions and 2 deletions
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4
drivers/net/wireless/rtl818x/rtl8187/dev.c
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@ -1636,10 +1636,10 @@ static int rtl8187_probe(struct usb_interface *intf,
err_free_dmabuf:
kfree(priv->io_dmabuf);
err_free_dev:
ieee80211_free_hw(dev);
usb_set_intfdata(intf, NULL);
usb_put_dev(udev);
err_free_dev:
ieee80211_free_hw(dev);
return err;
}