From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 22F862AD00; Sun, 7 Jun 2026 10:19:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780827553; cv=none; b=A7+ct0pGWr7zboj7bgqe3F8ce77fzAa0tLVDi9cgZWGqPFDBNPt98dQ/harzpzgu7Qe0FtXGK50Ci7r41ecpnq2Svzl4lqvEBtN93R4CyWYaZ9a5Vr0qEPSv6aDi+d8igpKCU3Mx910q+RVHnazyYlfhXv2ZFwJWLqKn3MU6rAA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780827553; c=relaxed/simple; bh=Mb7AE2tjPSO3u1lneIJMNINIGJNdvGyexBE7K2lQCOk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DJFH5LKHeXLiS+0845kA+P/AZcNPrv4w+27qEZ0rida0wOx5wHrMFcEq6b3AwUK2OB7oVqEU8CVtRoju6i2d7ixAwTHUDvsVT7ORZgNCxBV/Vz7GvF2Ht30uekTEElJH6h0oSZ/eOq7Lo6r4vdnSqj18UxRFmXAQQkKuYGuJujc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=tYrs1JAK; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="tYrs1JAK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B96C71F00893; Sun, 7 Jun 2026 10:19:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780827552; bh=BX9Zm2l82xaLVwaofCXT9i2fHhMNWc0YSUemfZEjA+E=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=tYrs1JAKvsDkYoWEVCasGIuHWo1scGGgHoodd5C9PPWVXJFPobsusaK8F3eC6gfkt mGNKmIk0C6ExKa4LEPE+fBMI0VZ088RZmpJMyPy0U+RFpCLCMWkrKysUjd3k5zbBqp LsISePHC1CGq9g4GzZkIsrcmCyBBLxuFvBTPRv6s= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhao Dongdong , Luiz Augusto von Dentz , Sasha Levin Subject: [PATCH 6.12 064/307] Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt() Date: Sun, 7 Jun 2026 11:57:41 +0200 Message-ID: <20260607095730.101564553@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260607095727.647295505@linuxfoundation.org> References: <20260607095727.647295505@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhao Dongdong [ Upstream commit 3c40d381ce04f9575a5d8b542898183c3b4b38dc ] The skb_clone() function can return NULL if memory allocation fails. send_mcast_pkt() calls skb_clone() without checking the return value, which can lead to a NULL pointer dereference in send_pkt() when it dereferences skb->data. Add a NULL check after skb_clone() and skip the peer if the clone fails. Fixes: 18722c247023 ("Bluetooth: Enable 6LoWPAN support for BT LE devices") Signed-off-by: Zhao Dongdong Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Sasha Levin --- net/bluetooth/6lowpan.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c index e5186a438290ae..03f0b5d27b60d3 100644 --- a/net/bluetooth/6lowpan.c +++ b/net/bluetooth/6lowpan.c @@ -485,6 +485,8 @@ static int send_mcast_pkt(struct sk_buff *skb, struct net_device *netdev) int ret; local_skb = skb_clone(skb, GFP_ATOMIC); + if (!local_skb) + continue; BT_DBG("xmit %s to %pMR type %u IP %pI6c chan %p", netdev->name, -- 2.53.0