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 2A7BF46D098; Tue, 21 Jul 2026 19:22:06 +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=1784661727; cv=none; b=lfOyHM5MhHPgRSrRseHZcM9SM74DABWLx8m5CHhxnu6ckXZ+QPZbNcD6tgmxL64CJ75AJDTPunZmJGPlomvOInprlTr0qQKSuvQkcGj3FhxkPFhFrS6Bo7qYT8dSPfp0yikATctNe2aqmnKef2Sfzl98T6HZqWpRNF+G5kuyuok= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784661727; c=relaxed/simple; bh=GYZpXOZJnNht0zRxuCH2KeIYhtU2fgmUt7Bkgtrdm3Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VJ/umFa0jBBl8cxV3UBGKAn6cs0U7zrRe4clxp9uNcw9Hq+fVXmWvOk0IOOuFozql+/otuIOuljo+j9ROCPp96HCAapJox/IU9eL7/BNCd5Up2pBcbSP+9tflSrcDin4By03M3LJ2YB+5ZlUFCYoakrHCleJGqUMBj/o9wTYEsM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PQqYvsON; 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="PQqYvsON" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 881C61F000E9; Tue, 21 Jul 2026 19:22:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784661726; bh=l8HJk0xcRFSJrE8Ozo2Vk32ekEwkl/vRLn/oFrWgl+E=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=PQqYvsONNk++QCtDd105xZHKi+ZnoQNl+cZd5jQWPFF4TwTEHfMxE5wMQPctJuufN J73+s8HY3svTVcmMP/oLMWyctdQ03iYqcPYQTAQMiW7HMWDkrZ5ylSeIk6kKdCpR6m u8RqMgald10tbLS7evyOwiTajGIOPPDU9wL+6g1I= 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 6.12 0174/1276] ipv6: guard against possible NULL deref in __in6_dev_stats_get() Date: Tue, 21 Jul 2026 17:10:17 +0200 Message-ID: <20260721152449.990530371@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152446.065700225@linuxfoundation.org> References: <20260721152446.065700225@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org 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: 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 363dd63babe72f..779a1049fa1b98 100644 --- a/include/net/addrconf.h +++ b/include/net/addrconf.h @@ -341,8 +341,11 @@ 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