In read_handle(), of_get_address() may return NULL which is later
dereferenced. Fix this by adding NULL check.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 14baf4d9c739 ("cxl: Add guest-specific code")
Signed-off-by: Ma Ke <make24@xxxxxxxxxxx>
---
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
