From: Dan Carpenter <error27@gmail.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Dan Carpenter <error27@gmail.com>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-staging@lists.linux.dev, kernel-janitors@vger.kernel.org
Subject: [PATCH] staging: rtl8192u: Fix use after free in ieee80211_rx()
Date: Wed, 23 Nov 2022 09:43:14 +0300 [thread overview]
Message-ID: <Y33BArx3k/aw6yv/@kili> (raw)
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>
---
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 f142d0986990..5c73e3f8541a 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c
@@ -951,9 +951,11 @@ 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;
}
--
2.35.1
reply other threads:[~2022-11-23 6:43 UTC|newest]
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