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authorAlexey Khoroshilov <khoroshilov@ispras.ru>2014-08-15 03:00:06 +0400
committerJohn W. Linville <linville@tuxdriver.com>2014-08-25 15:39:23 -0400
commit29e20aa6c6aff35c81d4da2e2cd516dadb569061 (patch)
tree622e9576448d921bca82e4ad7f275df647be0750
parente5cd6cee46764467e6cb14841ff59cd2e2573502 (diff)
at76c50x-usb: fix use after free on failure path in at76_probe()
After commit 174beab7d445 ("at76c50x-usb: Don't perform DMA from stack memory") at76_delete_device() and usb_put_dev() are called both if at76_init_new_device() fails in at76_probe(). But at76_delete_device() does usb_put_dev(priv->dev) itself that means double usb_put_dev(). The patch avoids the problem by moving usb_put_dev() from at76_delete_device() to at76_disconnect(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--drivers/net/wireless/at76c50x-usb.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/net/wireless/at76c50x-usb.c b/drivers/net/wireless/at76c50x-usb.c
index 334c2ec..da92bfa 100644
--- a/drivers/net/wireless/at76c50x-usb.c
+++ b/drivers/net/wireless/at76c50x-usb.c
@@ -2423,8 +2423,6 @@ static void at76_delete_device(struct at76_priv *priv)
kfree_skb(priv->rx_skb);
- usb_put_dev(priv->udev);
-
at76_dbg(DBG_PROC_ENTRY, "%s: before freeing priv/ieee80211_hw",
__func__);
ieee80211_free_hw(priv->hw);
@@ -2558,6 +2556,7 @@ static void at76_disconnect(struct usb_interface *interface)
wiphy_info(priv->hw->wiphy, "disconnecting\n");
at76_delete_device(priv);
+ usb_put_dev(priv->udev);
dev_info(&interface->dev, "disconnected\n");
}