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 D085B2E739E; Sun, 7 Jun 2026 10:11:59 +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=1780827120; cv=none; b=H5vPC5FbPtulvEWxahK+E987vuhyeG1F8/IRyWvR02Q7Hh4AzVO0cxLlohY8U135OK45ImbZ/CC6rIXpuzRjrp2LE+Umv77+YJujz3Ecy3ub0XasU9Cfcpklf+Busp+pSFsA8pnFU+rojQu5feynifG1F1b1M9bUfLG2Y4/D8/w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780827120; c=relaxed/simple; bh=sc2NLlmL5UttOEa7V4QVcn2zEDkiSEZx8dP58fpmEi4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZO7RWxesLkoJLDNikW84RvlWwlsRl+ZcF1+uOns7C9L3vmOZYxIwVKbbQDrpvucRAtHSp4S3U0+aLCrBxZv5dF8f9LYnsI8EEKeMuWJVXkHiG26/8DJQ+d7XkGySOdruyAG1VNLIxz5T49XpGyxmLijHnpoPbmn2sypyZV38oBk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=HgJmii3r; 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="HgJmii3r" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 194991F00893; Sun, 7 Jun 2026 10:11:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780827119; bh=qeJrjxt1kL6qLSzb7gvAOxyz2J3/j1Oi/p9GePTJvuA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=HgJmii3rl0HHGASooxnJXfd53qFZzjA0687UtIhZXul706ui3yZoA+pWhXP03D1qY UAe5hHcy7gZAlR/9+87YvZMf2zaMqFdJLTBeoM7JLa53APdqfyAQiRVXj9G+sf2ozJ 1H5uIqUgMXXyRnEusPMFTB1Rbz5wlHg5LHR1+IB0= 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 7.0 064/332] Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt() Date: Sun, 7 Jun 2026 11:57:13 +0200 Message-ID: <20260607095730.483335491@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260607095728.031258202@linuxfoundation.org> References: <20260607095728.031258202@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 7.0-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 2f03b780b40d84..960a19b3e26da1 100644 --- a/net/bluetooth/6lowpan.c +++ b/net/bluetooth/6lowpan.c @@ -486,6 +486,8 @@ 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