From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CB1FA6FA0 for ; Mon, 16 Jan 2023 16:48:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B8CCC433D2; Mon, 16 Jan 2023 16:48:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673887686; bh=5dyIveQccTfcAJWUhuO6CtGavwCW5XThzT5Jsp/7enU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pFyFnEbFsrHCcxsrPaR5OKemM/w965sJ/CYympjv2QGyT53NyFUDR9K0/XNETeIo5 zbBwtQTZAKqs0nNiJ2hQNOHEQU9Mj4VmrAkeEujyk3inRFr809ErfBaudeQospwojb n7Z75XGvSm2h8N3YYjIeGgkh3a3S6Kag0hRzq4Ns= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Carpenter , Sasha Levin Subject: [PATCH 4.19 244/521] staging: rtl8192u: Fix use after free in ieee80211_rx() Date: Mon, 16 Jan 2023 16:48:26 +0100 Message-Id: <20230116154858.060629174@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154847.246743274@linuxfoundation.org> References: <20230116154847.246743274@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Dan Carpenter [ 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 Link: https://lore.kernel.org/r/Y33BArx3k/aw6yv/@kili Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- 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 fb824c517449..14b3daa5f17e 100644 --- a/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c +++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_rx.c @@ -961,9 +961,11 @@ 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