From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 00F301C5F2F; Wed, 19 Feb 2025 08:45:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739954733; cv=none; b=er9Y6RewEZ2IuHs74ywFpH5BERECtE8jGatY+vj0+jGLq+5ZSfAZQfFnEpLSWEVZVysmfLYGwv49FeIv11Qu4N9hnDz4ZS2MdrzIMnfVjaiDg2R9Yq3UKF6JPTQj78aUImw68DS/vyOJLUGsVCg0hALV4jz4V0UIQIKU+zXAxrg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739954733; c=relaxed/simple; bh=mDmtzJXPEGXtmQT9E8+7id4TdGQSfEWXoPpl8EFAYwo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JXZarmlRJDhe5mynCQZ4SbMlEcybP2XYiZjSBQiwxHkIeQfYzSBUE26aDTPEJyBSqTK2vnPg/aUcDbvIRxFW8ZXCJ89Sp0oIEGvKATXnRHr5GUyBPD9UUh4vPkQLR8QCm+HeFl+dXIT4qYKwx0q04FOxy/lUtG4+oXK8IXZoleQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=z0dsnTsr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="z0dsnTsr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74C58C4CED1; Wed, 19 Feb 2025 08:45:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739954732; bh=mDmtzJXPEGXtmQT9E8+7id4TdGQSfEWXoPpl8EFAYwo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=z0dsnTsrLGoXsi4K5iBXkvEnfLVt5iT7PQHJsFgJtW/Yro9kQFmxGEn9vUphFR+xD gcEj9SeveHLYK7pP6JtXgOY8oUI2sf8Re33E4t3cdDzr2lTkp42jJG828GjKQOVmqM /i22a4QVDSgOxYbAor1b2q8w2iaWlxUwmRgIOL8E= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Stephen Suryaputra , David Ahern , Kuniyuki Iwashima , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.12 019/230] ndisc: ndisc_send_redirect() must use dev_get_by_index_rcu() Date: Wed, 19 Feb 2025 09:25:36 +0100 Message-ID: <20250219082602.455115468@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250219082601.683263930@linuxfoundation.org> References: <20250219082601.683263930@linuxfoundation.org> User-Agent: quilt/0.68 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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet [ Upstream commit 48145a57d4bbe3496e8e4880b23ea6b511e6e519 ] ndisc_send_redirect() is called under RCU protection, not RTNL. It must use dev_get_by_index_rcu() instead of __dev_get_by_index() Fixes: 2f17becfbea5 ("vrf: check the original netdevice for generating redirect") Signed-off-by: Eric Dumazet Cc: Stephen Suryaputra Reviewed-by: David Ahern Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20250207135841.1948589-2-edumazet@google.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/ipv6/ndisc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index d044c67019de6..264b10a947577 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1694,7 +1694,7 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) bool ret; if (netif_is_l3_master(skb->dev)) { - dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); + dev = dev_get_by_index_rcu(dev_net(skb->dev), IPCB(skb)->iif); if (!dev) return; } -- 2.39.5