From feb3d627facbf5df5cc0fc3dd4b64c5b8cb7ceff Mon Sep 17 00:00:00 2001 From: Lin Ma Date: Mon, 8 Nov 2021 18:37:59 +0800 Subject: [PATCH] hamradio: defer 6pack kfree after unregister_netdev commit 0b9111922b1f399aba6ed1e1b8f2079c3da1aed8 upstream. There is a possible race condition (use-after-free) like below (USE) | (FREE) dev_queue_xmit | __dev_queue_xmit | __dev_xmit_skb | sch_direct_xmit | ... xmit_one | netdev_start_xmit | tty_ldisc_kill __netdev_start_xmit | 6pack_close sp_xmit | kfree sp_encaps | | According to the patch "defer ax25 kfree after unregister_netdev", this patch reorder the kfree after the unregister_netdev to avoid the possible UAF as the unregister_netdev() is well synchronized and won't return if there is a running routine. Signed-off-by: Lin Ma Signed-off-by: David S. Miller Signed-off-by: Ovidiu Panait Signed-off-by: Greg Kroah-Hartman --- drivers/net/hamradio/6pack.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c index 3d5b2b4899ec..7ff1c6f7eea2 100644 --- a/drivers/net/hamradio/6pack.c +++ b/drivers/net/hamradio/6pack.c @@ -690,9 +690,11 @@ static void sixpack_close(struct tty_struct *tty) del_timer_sync(&sp->tx_t); del_timer_sync(&sp->resync_t); - /* Free all 6pack frame buffers. */ + /* Free all 6pack frame buffers after unreg. */ kfree(sp->rbuff); kfree(sp->xbuff); + + free_netdev(sp->dev); } /* Perform I/O control on an active 6pack channel. */ -- 2.20.1