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 CAAA1136351; Tue, 21 Jul 2026 20:30:08 +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=1784665809; cv=none; b=c9zZif19M92WoTpe3MaIJLmVoBSohL/Z7L46NwjJ2fRrHy1EaoBMlmu8dgpiZuF0FA7wkvGM345WFwTrqnggT5JRxRXd+eZFdQPvdTgBhUGpGfbfiNd7+bvUqoNqflebS4Cf60A4HC38TDlg1R4Yfl6/0hsUcjQiZcYY7RpakUk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784665809; c=relaxed/simple; bh=KDwFOINa++G+LV7sMUHwdgYmnt5FS0qLgW49eX0y0sQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Eso2NBJ2b/egp3d4bEBVRHJiah+D3EQDAYl/X7E0fk6gbga8m2+65/oUqHEsO0qcAN9vya3AKsHbvY7AE/bsoUenDCOR8ciPMcQBAMCGWTqpb2MGokC6pLrlRsgOICzhIHf9aHXTgwV/c6S0HTYtxAG2tW2MyzQbFGNolcKs8cE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=XrWXfKgl; 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="XrWXfKgl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3AE551F000E9; Tue, 21 Jul 2026 20:30:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784665808; bh=H4Utr2rsIJx8ZxMriHZpx2HR/5oKVYi/47XJ+nloSmw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=XrWXfKglv3UmCqu+qLQkf9+ycPLHYSEWVAOCK8UgHZgrO4ivNuLM999W1Igp72kl1 cUcriTF+7Xf4G2EPg+Zv//g/sqZhiAg04Ef0407kQIPnPJr56VVbz8/Ks9WZuPyO4t Fqw5jERsPXpy+I8FLeBbg3rx+C2vAjafovne44o4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Stephen Suryaputra , Ido Schimmel , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.6 0443/1266] ipv6: guard against possible NULL deref in __in6_dev_stats_get() Date: Tue, 21 Jul 2026 17:14:40 +0200 Message-ID: <20260721152451.751792949@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152441.786066624@linuxfoundation.org> References: <20260721152441.786066624@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit 507541c2a8eeb76c02bd2511958f73a8cfa3e1bc ] dev_get_by_index_rcu() could return NULL if the original physical device is unregistered. Found by Sashiko. Fixes: e1ae5c2ea478 ("vrf: Increment Icmp6InMsgs on the original netdev") Signed-off-by: Eric Dumazet Cc: Stephen Suryaputra Reviewed-by: Ido Schimmel Link: https://patch.msgid.link/20260526145529.3587126-2-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- include/net/addrconf.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/include/net/addrconf.h b/include/net/addrconf.h index facb7a469efad6..e596f57f680dc1 100644 --- a/include/net/addrconf.h +++ b/include/net/addrconf.h @@ -334,8 +334,11 @@ static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev, const struct sk_buff *skb) { - if (netif_is_l3_master(dev)) + if (netif_is_l3_master(dev)) { dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb)); + if (!dev) + return NULL; + } return __in6_dev_get(dev); } -- 2.53.0