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[83.99.135.235]) by smtp.gmail.com with ESMTPSA id w23sm21250ljj.134.2021.07.07.14.38.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jul 2021 14:38:38 -0700 (PDT) From: Davis Mosenkovs To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, Davis Mosenkovs Subject: [PATCH 4.14] mac80211: fix memory corruption in EAPOL handling Date: Thu, 8 Jul 2021 00:38:34 +0300 Message-Id: <20210707213834.1088078-1-davis@mosenkovs.lv> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Commit 557bb37533a3 ("mac80211: do not accept/forward invalid EAPOL frames") uses skb_mac_header() before eth_type_trans() is called leading to incorrect pointer, the pointer gets written to. This issue has appeared during backporting to 4.4, 4.9 and 4.14. Fixes: 557bb37533a3 ("mac80211: do not accept/forward invalid EAPOL frames") Link: https://lore.kernel.org/r/CAHQn7pKcyC_jYmGyTcPCdk9xxATwW5QPNph=bsZV8d-HPwNsyA@mail.gmail.com Signed-off-by: Davis Mosenkovs --- net/mac80211/rx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index ac2c52709e1c..87926c6fe0bf 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -2404,7 +2404,7 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx) #endif if (skb) { - struct ethhdr *ehdr = (void *)skb_mac_header(skb); + struct ethhdr *ehdr = (struct ethhdr *)skb->data; /* deliver to local stack */ skb->protocol = eth_type_trans(skb, dev); -- 2.25.1