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[107.146.107.67]) by smtp.gmail.com with ESMTPSA id q15-20020a056130028f00b007da5ea1638asm1488240uac.1.2024.02.28.09.18.44 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Feb 2024 09:18:44 -0800 (PST) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH v1 4/4] Bluetooth: bnep: Fix out-of-bound access Date: Wed, 28 Feb 2024 12:18:38 -0500 Message-ID: <20240228171838.2414532-4-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240228171838.2414532-1-luiz.dentz@gmail.com> References: <20240228171838.2414532-1-luiz.dentz@gmail.com> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Luiz Augusto von Dentz This fixes attempting to access past ethhdr.h_source, although it seems intentional to copy also the contents of h_proto this triggers out-of-bound access problems with the likes of static analyzer, so this instead just copy ETH_ALEN and then proceed to use put_unaligned to copy h_proto separetely. Signed-off-by: Luiz Augusto von Dentz --- net/bluetooth/bnep/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c index 5a6a49885ab6..a660c428e220 100644 --- a/net/bluetooth/bnep/core.c +++ b/net/bluetooth/bnep/core.c @@ -385,7 +385,8 @@ static int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb) case BNEP_COMPRESSED_DST_ONLY: __skb_put_data(nskb, skb_mac_header(skb), ETH_ALEN); - __skb_put_data(nskb, s->eh.h_source, ETH_ALEN + 2); + __skb_put_data(nskb, s->eh.h_source, ETH_ALEN); + put_unaligned(s->eh.h_proto, (__be16 *)__skb_put(nskb, 2)); break; case BNEP_GENERAL: