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=1793211530; b=IVmNekk0UGkHCaRzrZyG6scrF9XPfTo7hzYCr3i28B1WYoMDzbgp9LCKxDIRVAmpFvk/ A63Ciz+plq3sIpnJmSWxW7Kfcu8Lw5svJt2yOhB3i4kroXpXVKJ7PBUtOO5u3WfmGSYs+ ikbf7OkXiZGq0YF4j3w4hiGvQIYD+hlRLwXLCaqNxkf5hUhaZDleEUWSbZnYRLPq7EcDZ Y4X98oA18eOVBNhoZ/CdQY9RYK3S13WKHS+tf6PfyS+IWw4pQhoGY+iD0OZYh8O+dSMXi vwOK/zk9yIMH4Ei5D80PS5+bdBQra8vJ6Z2BHDPcWk4yVYg+HZucda97FsIMPuL5bww== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793211530; 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=g7CHa46fW7KKHmJdKsUZosmrPVQ6QmBPLVD49Jo30CI=; b=EtCW04SVUGeA7MzRttcnImPpIbV3ja03s5p7Vx20tWJRGr/m+sYVNyd8g0ybXltpEg0v f3MlfeHTrEmZU9cu/8BGbAhzpccJBvoBfHpiy5UzvFKAnisMoFnglErcFRxCS7fUfX3Ew yKtiHkIeQ+imIVoKYdzD3rTmc3saoI9NZr3mU845KHE3i3IicQ/n5tZI2mYdkQDFF3+fm xP2qe29a7Ba5oToP+hoLlI/n32rjrfUZixZ69rVBd5jf2VosPFYCwnzGEfdcyEQml0Gks uGiCEp8N8ZsYKuQ9YmHzt/tsZgOv98rwpEbf/ng53mX5MRyq0zTMZ+K9YN8eR3Heb7A== 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=uz6fC5jC; 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 7554F606A31A; Wed, 28 Oct 2026 18:18:50 +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=uz6fC5jC Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8D7851F01825; Wed, 28 Oct 2026 18:18:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793211530; bh=g7CHa46fW7KKHmJdKsUZosmrPVQ6QmBPLVD49Jo30CI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=uz6fC5jCvrUHVsJ9Yai5fWfE2judgUM8xnU5ZtpLSD/FCvsJNXc+ukHDOMp9cTOCo GiTKyhgtaAtXpjmAe8uS6kNwp6EBynwJuCS6TCm2tir0+KlfPdkZl4wfOGzRKBabkE 0SHo02vfl7PbDYFRMDV1MGpvjLbtmOEAB3RF2mg0= 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 5.15 408/571] dlm: validate length in dlm_search_rsb_tree Date: Wed, 28 Oct 2026 17:59:15 +0100 Message-ID: <20261028170017.694215279@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170008.009143722@linuxfoundation.org> References: <20261028170008.009143722@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 5.15-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 ffe12593a8b79..88ef7ad1494e2 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -449,6 +449,8 @@ int dlm_search_rsb_tree(struct rb_root *tree, char *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