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 1FA3233FE12 for ; Sat, 28 Feb 2026 17:48:39 +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=1772300919; cv=none; b=Xhzy7Ogeyau24LawHabei59saYNTrcR28H7JZEcoTJF7hbf1qPxdyOvVLb50Bz0VjQNB3joPRebhJWEeAvV1q6eVkfnUL6/UPv+8G+ZiJ8mcrbHBhmJ0h7Qq129hcihTdH1AQVblE9LSXdYyRbw5+d/9zXRO3OwTnZgi4s/Wl44= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772300919; c=relaxed/simple; bh=qFxe7UMVks0SzFECFu0TKvPZLn9NTWwEwRkXjs1MK28=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pQTlWuvLO7MzIRtNAdcTa6EhqKG6qv/rG1zG7pfPIrwhwvK+QNAZqJ6P8ozmxRcSM78OlLL4x8Vo6s5i/+IOwnzjcrU7w1zc/raF5zLrrOpj6Qq1pVJJyUnqKTOgGq37EYSmcw9R3bZ3bByBPsTtSqYgLpGh7Ao85RQRYRrR8Zc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PXRREQsv; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PXRREQsv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6DFF7C2BC87; Sat, 28 Feb 2026 17:48:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772300919; bh=qFxe7UMVks0SzFECFu0TKvPZLn9NTWwEwRkXjs1MK28=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PXRREQsvu0SA/w1MqkpYinL/s7XJqNmze7jlwvSCtczXL8kLUj3xeHNt7LlyRGn2F 5TiTZoo3iG6R8KdON5PIoTgeByWrcXH0Kl0LO2bbckQXTCT9l1LyjwiuPLQfnl2u34 UI9s6kS1fftS5p6lalaYNzbOoxjd2/vCG5O05NYx/JeMdjvmY9QnycX6d+avqULL83 xDYRWC+bQeFeQOZnX/DHEEPhdCXnS5eMgrXQVCzg6Q1Ub9Z4IHCRiRD0zu4yUsU79G tWjzdIeuG0jc9xx3E/tJ0sLMBSjaRg4BgmGivh95HnLm7oWL6QsVMDSprjwI9xrNS5 4Oo2mYFnBgXwg== From: Sasha Levin To: patches@lists.linux.dev Cc: Ezrak1e , Alexander Aring , David Teigland , Sasha Levin Subject: [PATCH 6.18 035/752] dlm: validate length in dlm_search_rsb_tree Date: Sat, 28 Feb 2026 12:35:46 -0500 Message-ID: <20260228174750.1542406-35-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228174750.1542406-1-sashal@kernel.org> References: <20260228174750.1542406-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit 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 Signed-off-by: Sasha Levin --- fs/dlm/lock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index c01a291db401b..a393ecaf3442a 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -626,7 +626,8 @@ int dlm_search_rsb_tree(struct rhashtable *rhash, const void *name, int len, struct dlm_rsb **r_ret) { char key[DLM_RESNAME_MAXLEN] = {}; - + if (len > DLM_RESNAME_MAXLEN) + return -EINVAL; memcpy(key, name, len); *r_ret = rhashtable_lookup_fast(rhash, &key, dlm_rhash_rsb_params); if (*r_ret) -- 2.51.0