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 067A91D89F5; Tue, 15 Oct 2024 11:50:49 +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=1728993049; cv=none; b=AmU2yT1xQeU7xKSs0Pv20qKsa9DQmg/g6IiucNpdHyEHIhVT/MVfh9gttNvRuLYde9UU1LCdtRo1rRePJVfVpZ4oAZ0UYXUKcOTNnRxk0futg6i0tctMzlRC/aqMcSphRkrQjM25QcvH44cLC7GsckryKSKokQGTsA9leSFkEWU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728993049; c=relaxed/simple; bh=//4jkGq5oDmtxzSt0kZYGZnebF+RwKISNg1o8mWyLDk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=n0rLRsZXra6izElxA9zaprhaUT0WgGgTP21BNDQOTUtfQKTqLfzNlPbsTM6GpPq8YC7jVHVsa1pEc/q37FBl+HD73oBXRUAPx0WpajD73/D2t+PUhIMAmY6RXd3NP+exJpJRanIJq6QNn3OQXplWtxeMcspcXGujM9R64IIl53Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=0Jym9A6C; 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="0Jym9A6C" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 69FCBC4CEC6; Tue, 15 Oct 2024 11:50:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1728993048; bh=//4jkGq5oDmtxzSt0kZYGZnebF+RwKISNg1o8mWyLDk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0Jym9A6CC6vbmXAaoCRpx6IB7wWMjZRKn0L578zHcKHHAZlIBxULSbcQ1KwjxIG0E ix2VbdQYnKDW0/j5YlcUQKFOmBSHrm4eZYUGxKvuAsKYEZTbStElc8v+wGuWZz4ygt O24FxWd8waUfzyHwKIgvSgSKD1e1jatjnT7kziNk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+c187823a52ed505b2257@syzkaller.appspotmail.com, Jiwon Kim , Nikolay Aleksandrov , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 296/691] bonding: Fix unnecessary warnings and logs from bond_xdp_get_xmit_slave() Date: Tue, 15 Oct 2024 13:24:04 +0200 Message-ID: <20241015112452.093365146@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241015112440.309539031@linuxfoundation.org> References: <20241015112440.309539031@linuxfoundation.org> User-Agent: quilt/0.67 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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jiwon Kim [ Upstream commit 0cbfd45fbcf0cb26d85c981b91c62fe73cdee01c ] syzbot reported a WARNING in bond_xdp_get_xmit_slave. To reproduce this[1], one bond device (bond1) has xdpdrv, which increases bpf_master_redirect_enabled_key. Another bond device (bond0) which is unsupported by XDP but its slave (veth3) has xdpgeneric that returns XDP_TX. This triggers WARN_ON_ONCE() from the xdp_master_redirect(). To reduce unnecessary warnings and improve log management, we need to delete the WARN_ON_ONCE() and add ratelimit to the netdev_err(). [1] Steps to reproduce: # Needs tx_xdp with return XDP_TX; ip l add veth0 type veth peer veth1 ip l add veth3 type veth peer veth4 ip l add bond0 type bond mode 6 # BOND_MODE_ALB, unsupported by XDP ip l add bond1 type bond # BOND_MODE_ROUNDROBIN by default ip l set veth0 master bond1 ip l set bond1 up # Increases bpf_master_redirect_enabled_key ip l set dev bond1 xdpdrv object tx_xdp.o section xdp_tx ip l set veth3 master bond0 ip l set bond0 up ip l set veth4 up # Triggers WARN_ON_ONCE() from the xdp_master_redirect() ip l set veth3 xdpgeneric object tx_xdp.o section xdp_tx Reported-by: syzbot+c187823a52ed505b2257@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=c187823a52ed505b2257 Fixes: 9e2ee5c7e7c3 ("net, bonding: Add XDP support to the bonding driver") Signed-off-by: Jiwon Kim Signed-off-by: Nikolay Aleksandrov Link: https://patch.msgid.link/20240918140602.18644-1-jiwonaid0@gmail.com Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- drivers/net/bonding/bond_main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index fd0667e1d10ab..67d153cc6a6c0 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -5191,9 +5191,9 @@ bond_xdp_get_xmit_slave(struct net_device *bond_dev, struct xdp_buff *xdp) break; default: - /* Should never happen. Mode guarded by bond_xdp_check() */ - netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", BOND_MODE(bond)); - WARN_ON_ONCE(1); + if (net_ratelimit()) + netdev_err(bond_dev, "Unknown bonding mode %d for xdp xmit\n", + BOND_MODE(bond)); return NULL; } -- 2.43.0