From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793213428; b=jw+HMu+1YFHFO7iIY4LwieEpzoLRIILCgYNDRB25P9cqviv5bWXw/tnL98UDhUNlkvWx bmhVRK4Uvw1QfBE4cVjIoqy8mhtUI8xO+Ewar7o9W3Dp+eW7VuDASiUOil8erEl2VX8CU g2M/3W3OxeN5tXSBKV4Vo08HtDAo/ugFSuWwvd+/FeY5wv6ae4I6C2iv5zitqEqBFM6Fm aYAtN7cCwN8A3aQI5DKg/qZq146B5A15BxG/PS5NgSVQJBN+S6p/RkkUt7wAUMu1EXFrT GaPyGphcvNt8osPQOhXK8EoVqpNTj0hYg8mDrj8ychY71e0/pDAJY0prJKlcgcuHsDA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793213428; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=1Ovq51iY/uHBh1TkF61NHBKul+E0x/zdvSMrrwDaFCc=; b=oCY3zi2l30PFK0B0h+9iecwKs3+M2vdCkX5xSVOWcjftpOTEVp91e/vleqH9hZaujhR3 6LghNk9ASwqvITxEbfBxDuAaZOCoxzdmPwcKLFpFH31mxs9KI0QMmI8g9wJ1S3WxzE7Zs 8C+RWirh9bevm9QwTFd/nk+qPhY+XDE79kTuOgQnJX6HjtoZr1HpsaJCBPOlyee81XucB ixYKOwLcZQTiITqn9QVGwAB4OpHTPAzmS79rfnRVVQQ/8fGxpSthJejUmqMX6fku4erAA fGq64dEV9kVsTAgV2DTWo7+XVXMp6VabBk5d7AvS6Vvrn3GyJ/Y1RUe51HXhOS+knlQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=PxQZYmAj; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E869E606A31E; Wed, 28 Oct 2026 18:50:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=PxQZYmAj Received: by smtp.kernel.org (Postfix) with ESMTPSA id 491741F01825; Wed, 28 Oct 2026 18:50:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793213427; bh=1Ovq51iY/uHBh1TkF61NHBKul+E0x/zdvSMrrwDaFCc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=PxQZYmAj8C6pAe44iDtQKdt+do3kFeXdi0jZ9ySB6Ci5ZzcVnIoueoFC2fXZwKach omAKZtKW9WkQ/PrW5lSZAVRFpCQQMm08Md6veUFHv8+vLwvZGjJgxvi7e5QLymXuH4 7DzHWPTbn2ZubxL1zRE86ATymG6gzhZaw11/4eF0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ezrak1e , Alexander Aring , David Teigland , Srikanth C S , Harshit Mogalapalli , Sasha Levin Subject: [PATCH 6.1 0502/1887] dlm: validate length in dlm_search_rsb_tree Date: Wed, 28 Oct 2026 17:43:18 +0100 Message-ID: <20261028170510.722114403@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170459.200466217@linuxfoundation.org> References: <20261028170459.200466217@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ezrak1e [ Upstream commit 080e5563f878c64e697b89e7439d730d0daad882 ] The len parameter in dlm_dump_rsb_name() is not validated and comes from network messages. When it exceeds DLM_RESNAME_MAXLEN, it can cause out-of-bounds write in dlm_search_rsb_tree(). Add length validation to prevent potential buffer overflow. Signed-off-by: Ezrak1e Signed-off-by: Alexander Aring Signed-off-by: David Teigland [ Contextual conflict due to dlm_search_rsb_tree() using the RB-tree implementation instead of rhashtable.] Signed-off-by: Srikanth C S Signed-off-by: Harshit Mogalapalli Signed-off-by: Sasha Levin --- fs/dlm/lock.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index d5aeda3399f95..8c2d4bc290177 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -456,6 +456,8 @@ int dlm_search_rsb_tree(struct rb_root *tree, const void *name, int len, struct dlm_rsb *r; int rc; + if (len > DLM_RESNAME_MAXLEN) + return -EINVAL; while (node) { r = rb_entry(node, struct dlm_rsb, res_hashnode); rc = rsb_cmp(r, name, len); -- 2.53.0