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 BC5953D16EF; Tue, 21 Jul 2026 22:39:24 +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=1784673565; cv=none; b=TTiRfryNbqo6hnS2RtVTdDBrEATzEq3NKHnb3W9wHS88OIdN/76AWrBNCv80b2OSj3f9VWAWBZEXTjb1n+Ipvo2CNXZV10BccnLYev2iloh3kezgOtgTEFD6HyHpux/cUWsuu5FFi2ZekO3LXvlAUBYl4n6j1cTm6Vm3jLOdBpU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784673565; c=relaxed/simple; bh=riUOjoe1La55yqYKeOgy9FTOhtNoZHHNfNXOqBJTieI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=N2ghikBFtrsf5Bb11InVE4rlGqSgpVfW9I97fG3M5MMhOi535h/LWqZAf+Uq/R9qfMNKyyp4t/lhskAjnSYKphTp9WThREFaRmFJfiYSeRUAVBvA5tOr/vSf74GUIWt6Kgd0B/jdWu1d5NNT4G8h1wnHLTAjZCz0MZFkFslM+DM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mrv4Axru; 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="mrv4Axru" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D68F1F000E9; Tue, 21 Jul 2026 22:39:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784673564; bh=akY02BESHKR8ols6VVMK575RGvw2gWAnh7pEg1Mnb1s=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mrv4AxruH72dZUixOR+bQTFE6DuSN/5SfUr9PZiNRAnH/1OMrwNyQux1OabS3H8CG 0xtpRcPArOHl28JQx0mO/oTER+ChB7jxdy2GcmEi9LhX93QIXcGJ5ZU/4HEj2SQW2l frXmHqTIfeSvgf5ljG7PqiQpXvJqPkc2xQmfRr5M= 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 5.10 209/699] ipv6: guard against possible NULL deref in __in6_dev_stats_get() Date: Tue, 21 Jul 2026 17:19:28 +0200 Message-ID: <20260721152400.413495854@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152355.667394603@linuxfoundation.org> References: <20260721152355.667394603@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 5.10-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 f666d3628d6aa8..0d6a20841d3ac8 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