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 DEF8D1863 for ; Wed, 28 Dec 2022 15:31:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4FFCEC433D2; Wed, 28 Dec 2022 15:31:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672241482; bh=uY69BWEonealXJRxRIe5Mc0O8gFvWHAWmyGV5wrFU7k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HZCksEWsX7M/elAjk8XjQ2LPRHQULPZpJ4+y22qimgJyrNVmNxu0s3qnyG6Xljefr Lk3vmuQfU579CR5k92Z5tUnGs+nb1yfTl5zYzrLlm8WrptSsXPLRU3YiRlZt5wvqD+ W/+Tw5rPtRLmgVV4wX9MTeNOol1HejtbM3DuufyM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Carpenter , Sasha Levin Subject: [PATCH 5.15 487/731] staging: rtl8192u: Fix use after free in ieee80211_rx() Date: Wed, 28 Dec 2022 15:39:54 +0100 Message-Id: <20221228144310.665518976@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20221228144256.536395940@linuxfoundation.org> References: <20221228144256.536395940@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 b58e75932ecd..3686b3c599ce 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