The "gasket_dev->num_page_tables" variable is an int but this is copying
sizeof(u64). On 32 bit systems this would end up disclosing a kernel
pointer to user space, but on 64 bit it copies zeroes from a struct
hole.
Fixes: 9a69f5087ccc ("drivers/staging: Gasket driver framework + Apex driver")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
This is an API change. Please review this carefully! Another potential
fix would be to make ->num_page_tables a long instead of an int.
drivers/staging/gasket/gasket_ioctl.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/gasket/gasket_ioctl.c b/drivers/staging/gasket/gasket_ioctl.c
index e3047d36d8db..c4abac35c1ca 100644
--- a/drivers/staging/gasket/gasket_ioctl.c
+++ b/drivers/staging/gasket/gasket_ioctl.c
@@ -318,7 +318,7 @@ long gasket_handle_ioctl(struct file *filp, uint cmd, void __user *argp)
case GASKET_IOCTL_NUMBER_PAGE_TABLES:
trace_gasket_ioctl_integer_data(gasket_dev->num_page_tables);
if (copy_to_user(argp, &gasket_dev->num_page_tables,
- sizeof(uint64_t)))
+ sizeof(gasket_dev->num_page_tables)))
retval = -EFAULT;
else
retval = 0;
--
2.29.2
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