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 2E6E53B38A2 for ; Wed, 17 Jun 2026 14:49:23 +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=1781707764; cv=none; b=WAzSQLSp3cxj+d3DGIWaQY3vGmNZ5LPJv1jWPj8nvPRBEgaa1aU2KyGx88WYuHWbH9qAY3bOBAK7X3UHdeYBNFNN7f+S4BQ0fidFOEAY2gwOFdyre77x/YqLX/cdsLwId9Bd6eTJvfcCraKhWDOU7t1hwAg2FNTTnwMg3lYgOkA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781707764; c=relaxed/simple; bh=ttANePPkO7P1BaCSZQpFItFrqnqjHZWxgMEo0jgIoTw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=OZA2bGydRvAeEFAfv13B6ewHjO9sdcInKyYW+UlL1cUUw1RNWVrC80cs8VUznkoGdYFBGlrvuJyb1kHIHUnMc8fJS0WvMmrXYBM7pT016/dArlGPrFZAfckNMBCRnD8Lk8gPDJUqHouqNQlH0A1y7YGc7bL9sCa8udH4gyKrOG0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cgdOQSCl; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cgdOQSCl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 680D91F00A3E; Wed, 17 Jun 2026 14:49:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781707763; bh=mlUuneOEXraJI0inpBsDP+A4/EPUliEN5nTwxU/J6Ew=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=cgdOQSClVa58OfdhzW9IoHiET35PVxCDY4c4scmmnG0tnBuKTSwgk2hvUuzfQJkiL VAAyMRu9Pu0jV00ugDtvKEkQgOsu9cvjGTTUf0MPxag83p75wtRxMk7glDeOF5DKm0 nxr0QwUdBf9cmoevpIrNRNTRHmstlmEJGwRIJ7VHXG1YDCxfxw1ARF1v01sVF95zwK oU6VEhIfcZ68Pz+ruu+Cc1RdoQGT48Mo2lcYqOK1wl+vL0P6rZhqtYk3jnr9x25IR5 qK/ub+kLVqUmwic4CkjBwxkzpktD0a39CGk+/lEXt/FuNBm6/o2nrTOYUp5WtOVqs9 ETjlpGELvGIfw== From: Sasha Levin To: stable@vger.kernel.org Cc: Santosh Kalluri , =?UTF-8?q?R=C3=A9mi=20Denis-Courmont?= , Simon Horman , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15.y 3/3] net: phonet: free phonet_device after RCU grace period Date: Wed, 17 Jun 2026 10:49:18 -0400 Message-ID: <20260617144918.39042-3-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260617144918.39042-1-sashal@kernel.org> References: <2026061547-discourse-faceless-4af5@gregkh> <20260617144918.39042-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Santosh Kalluri [ Upstream commit 71de0177b28da751f407581a4515cf4d762f6296 ] phonet_device_destroy() removes a phonet_device from the per-net device list with list_del_rcu(), but frees it immediately. RCU readers walking the same list can still hold a pointer to the object after it has been removed, leading to a slab-use-after-free. Use kfree_rcu(), matching the lifetime rule already used by phonet_address_del() for the same object type. Fixes: eeb74a9d45f7 ("Phonet: convert devices list to RCU") Cc: stable@vger.kernel.org Signed-off-by: Santosh Kalluri Acked-by: Rémi Denis-Courmont Reviewed-by: Simon Horman Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/phonet/pn_dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/phonet/pn_dev.c b/net/phonet/pn_dev.c index 2e7d850dc72668..3f020c362d6cde 100644 --- a/net/phonet/pn_dev.c +++ b/net/phonet/pn_dev.c @@ -105,7 +105,7 @@ static void phonet_device_destroy(struct net_device *dev) for_each_set_bit(addr, pnd->addrs, 64) phonet_address_notify(net, RTM_DELADDR, ifindex, addr); - kfree(pnd); + kfree_rcu(pnd, rcu); } } -- 2.53.0