[PATCH 2/2] staging: lustre: Use __user for a pointer to a user space address

From: M. Vefa Bicakci
Date: Sun Feb 28 2016 - 09:47:36 EST

This commit corrects two sparse warnings caused by the lack of a __user
annotation for the third argument of the libcfs_ioctl_handle function.

module.c:165:68: warning: incorrect type in argument 1
(different address spaces)
module.c:165:68: expected void [noderef] <asn:1>*arg
module.c:165:68: got void *arg
module.c:209:47: warning: incorrect type in argument 3
(different address spaces)
module.c:209:47: expected void *arg
module.c:209:47: got void [noderef] <asn:1>*arg

The need to have the __user annotation is supported by the fact that
libcfs_ioctl_handle passes its third argument to a helper function
(libcfs_ioctl_popdata) which also has a __user annotation for its
corresponding argument.

Signed-off-by: M. Vefa Bicakci <m.v.b@xxxxxxxxxx>
drivers/staging/lustre/lustre/libcfs/module.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/libcfs/module.c b/drivers/staging/lustre/lustre/libcfs/module.c
index 05e2c5625220..f3845dcee259 100644
--- a/drivers/staging/lustre/lustre/libcfs/module.c
+++ b/drivers/staging/lustre/lustre/libcfs/module.c
@@ -120,7 +120,7 @@ int libcfs_deregister_ioctl(struct libcfs_ioctl_handler *hand)

static int libcfs_ioctl_handle(struct cfs_psdev_file *pfile, unsigned long cmd,
- void *arg, struct libcfs_ioctl_hdr *hdr)
+ void __user *arg, struct libcfs_ioctl_hdr *hdr)
struct libcfs_ioctl_data *data = NULL;
int err = -EINVAL;