linux-kernel - [PATCH v2] cxl: Fix possible null pointer dereference in read

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-next>] [day] [month] [year] [list]

Message-Id: <20240710103352.1890726-1-make24@iscas.ac.cn>
Date: Wed, 10 Jul 2024 18:33:52 +0800
From: Ma Ke <make24@...as.ac.cn>
To: fbarrat@...ux.ibm.com,
	ajd@...ux.ibm.com,
	arnd@...db.de,
	gregkh@...uxfoundation.org,
	clombard@...ux.vnet.ibm.com,
	imunsie@....ibm.com,
	mpe@...erman.id.au,
	manoj@...ux.vnet.ibm.com
Cc: linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	Ma Ke <make24@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH v2] cxl: Fix possible null pointer dereference in read_handle()

In read_handle(), of_get_address() may return NULL which is later
dereferenced. Fix this by adding NULL check.

Cc: stable@...r.kernel.org
Fixes: 14baf4d9c739 ("cxl: Add guest-specific code")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
Changes in v2:
- The potential vulnerability was discovered as follows: based on our 
customized static analysis tool, extract vulnerability features[1], and 
then match similar vulnerability features in this function.
- Reference link:
[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=2d9adecc88ab678785b581ab021f039372c324cb
---
 drivers/misc/cxl/of.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/cxl/of.c b/drivers/misc/cxl/of.c
index bcc005dff1c0..d8dbb3723951 100644
--- a/drivers/misc/cxl/of.c
+++ b/drivers/misc/cxl/of.c
@@ -58,7 +58,7 @@ static int read_handle(struct device_node *np, u64 *handle)
 
 	/* Get address and size of the node */
 	prop = of_get_address(np, 0, &size, NULL);
-	if (size)
+	if (!prop || size)
 		return -EINVAL;
 
 	/* Helper to read a big number; size is in cells (not bytes) */
-- 
2.25.1