From: Dan Carpenter error27@gmail.com
[ Upstream commit bcc5e2dcf09089b337b76fc1a589f6ff95ca19ac ]
We cannot dereference the "skb" pointer after calling ieee80211_monitor_rx(), because it is a use after free.
Fixes: 8fc8598e61f6 ("Staging: Added Realtek rtl8192u driver to staging") Signed-off-by: Dan Carpenter error27@gmail.com Link: https://lore.kernel.org/r/Y33BArx3k/aw6yv/@kili Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c index b6fee7230ce0..3871437f4708 100644 --- a/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c +++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c @@ -954,9 +954,11 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb, #endif
if (ieee->iw_mode == IW_MODE_MONITOR) { + unsigned int len = skb->len; + ieee80211_monitor_rx(ieee, skb, rx_stats); stats->rx_packets++; - stats->rx_bytes += skb->len; + stats->rx_bytes += len; return 1; }