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 7C98F46D082; Tue, 21 Jul 2026 17:49:25 +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=1784656166; cv=none; b=ffwmNYTPUawL57VGWNavExlUpnsxaCB0UaRSyS7lIlCRSHNYGK76VuhkP6wDchMgh/ACdteuZfBNEhGMpTTfBUeXrPCAyq/TIlohx240TRrGKLaPxnR/0Ratbcg2/0SuWITuzh2Le3mGmsGhJaYYZ0rYUzx3j+1h2THKVPfXrVU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784656166; c=relaxed/simple; bh=SUPMkmCc6YWoJHwt6gOwDKkqblUUYYO7Mpf9iQgbHg0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TjIKaVSzVCdUpV8FFlSoh50pQkmcOTZl+YuiyHfB+C/KLr9c6qOznGVav75u/ul1E94kUx+ScIuIEmdlXcCGnm02XlmMgMNiuxPHTCYEzs0amKINFm1sWLj1/ut7S80h1j9BYZokQQGX1ymrfahFA29LZ8eGGnpYVHXZUuedPVo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=EDjLYOk5; 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="EDjLYOk5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A2C61F000E9; Tue, 21 Jul 2026 17:49:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784656165; bh=JOQI9K48M/gpETGRbcY2XmyjZUzi+1nXzjXAcFRFpwQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=EDjLYOk5Ju9Lbr8iJjrd+YZFrrsc3MkXwE1ztoJqi4F0SIkQnsjoyIYndUzgvSOPW yIPXJzT3XOoSLgTYnNYiPSpsGWoZ8zbRxIQq1NG3Dgo0ZSxiYRDuk2ZDWDy6oFb7yt c17XynnGxaAts4Zzh4NJnuduQTR6U0JrUxJrS630= 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 6.18 0241/1611] ipv6: guard against possible NULL deref in __in6_dev_stats_get() Date: Tue, 21 Jul 2026 17:05:57 +0200 Message-ID: <20260721152520.437323033@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152514.750365251@linuxfoundation.org> References: <20260721152514.750365251@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 6.18-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 9e5e95988b9e5d..c5a215ec14215d 100644 --- a/include/net/addrconf.h +++ b/include/net/addrconf.h @@ -363,8 +363,11 @@ static inline struct inet6_dev *__in6_dev_get_rtnl_net(const struct net_device * 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