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 2D83E35C682; Tue, 21 Jul 2026 22:06:30 +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=1784671591; cv=none; b=ZcKyhL2vjqG149p+YN1QcMUFw4Lrif2VKZTRRGuizYdAgEVWrnNtmsAuiCOGO6ChBlVSSxoWPUO0CnOJwIlBCzF6vPPixPTWQl/YA6fyk5I0/BoD384of1yRhuC59r6o4lrfSXggKr4erI6wB3p4b4tJegS5B1o1gmilnDq1rgE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784671591; c=relaxed/simple; bh=PR3nBNTgdsqayAf3kbIJ0Qg5HZsjlTjBMT1xfptyS6Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gIsYEAOW5si7dYXxHDKTwaH1ikb2NlcAMz3rYWwEnJ/oWEQ4OfkWGZIphaJZAciwwnfhOl7SZZ6zQoNaYzetaZBO6BjDX/+zLZ5iIeS8UWQMOo7yAdAZZPYezAevpGO5AL3s/yUcf8yMXHv6ndDuyMKtXu05HUr2ZLBlOU5TpOU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GC927WB9; 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="GC927WB9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 941E41F000E9; Tue, 21 Jul 2026 22:06:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784671590; bh=8cySC0frBvlUtQRs0EIfWbtfdXiJ+9KNWskIABfg8B0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=GC927WB9f2bAE3uwTxs/dwA09767p2QhquH9ymdemVX8O9xaIVxLELg6LDitvQb7t W+E+VZrWpx2kdtovtxP5GkTH4YHBeePTuG1kxZeodQIHoqNEk9d5I/HD1+7+YrN7XR tG96fremaE5kWUIPJ01aiPDocxT96M5PdE9Ge/cY= 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 5.15 267/843] ipv6: guard against possible NULL deref in __in6_dev_stats_get() Date: Tue, 21 Jul 2026 17:18:22 +0200 Message-ID: <20260721152412.028744220@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@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 5.15-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 5cf1a73774078a..39da955b0326f7 100644 --- a/include/net/addrconf.h +++ b/include/net/addrconf.h @@ -332,8 +332,11 @@ 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