netdev - [PATCH v3 07/20] cxl: harden resource_contains checks to handle zero size resources

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240907081836.5801-8-alejandro.lucero-palau@amd.com>
Date: Sat, 7 Sep 2024 09:18:23 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v3 07/20] cxl: harden resource_contains checks to handle zero size resources

From: Alejandro Lucero <alucerop@....com>

For a resource defined with size zero, resource_contains returns
always true.

Add resource size check before using it.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/hdm.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 3df10517a327..953a5f86a43f 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -327,10 +327,11 @@ static int __cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
 	cxled->dpa_res = res;
 	cxled->skip = skipped;
 
-	if (resource_contains(&cxlds->pmem_res, res))
+	if ((resource_size(&cxlds->pmem_res)) && (resource_contains(&cxlds->pmem_res, res))) {
 		cxled->mode = CXL_DECODER_PMEM;
-	else if (resource_contains(&cxlds->ram_res, res))
+	} else if ((resource_size(&cxlds->ram_res)) && (resource_contains(&cxlds->ram_res, res))) {
 		cxled->mode = CXL_DECODER_RAM;
+	}
 	else {
 		dev_warn(dev, "decoder%d.%d: %pr mixed mode not supported\n",
 			 port->id, cxled->cxld.id, cxled->dpa_res);
-- 
2.17.1