[PATCH] staging: gdm72xx: fix address space parse warnings

Okash Khawaja
2015-11-29T20:40:52Z

copy_to_user() and copy_from_user() functions expect the user space
pointers to be marked with __user. Sparse throws following warnings.

For copy_to_user():

warning: incorrect type in argument 1 (different address spaces)
expected void [noderef] <asn:1>*to
got void *buf

For copy_from_user():

warning: incorrect type in argument 2 (different address spaces)
expected void const [noderef] <asn:1>*from
got void *buf

This patch casts the user space pointers to have __user by using __force.

Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>
---
drivers/staging/gdm72xx/gdm_wimax.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/gdm72xx/gdm_wimax.c b/drivers/staging/gdm72xx/gdm_wimax.c
index d9ddced..16f8f35 100644
--- a/drivers/staging/gdm72xx/gdm_wimax.c
+++ b/drivers/staging/gdm72xx/gdm_wimax.c
@@ -371,6 +371,7 @@ static void kdelete(void **buf)
static int gdm_wimax_ioctl_get_data(struct data_s *dst, struct data_s *src)
{
int size;
+ void __user *p;

size = dst->size < src->size ? dst->size : src->size;

@@ -378,7 +379,9 @@ static int gdm_wimax_ioctl_get_data(struct data_s *dst, struct data_s *src)
if (src->size) {
if (!dst->buf)
return -EINVAL;
- if (copy_to_user(dst->buf, src->buf, size))
+
+ p = (__force void __user *)dst->buf;
+ if (copy_to_user(p, src->buf, size))
return -EFAULT;
}
return 0;
@@ -386,6 +389,8 @@ static int gdm_wimax_ioctl_get_data(struct data_s *dst, struct data_s *src)

static int gdm_wimax_ioctl_set_data(struct data_s *dst, struct data_s *src)
{
+ void __user *p;
+
if (!src->size) {
dst->size = 0;
return 0;
@@ -401,7 +406,8 @@ static int gdm_wimax_ioctl_set_data(struct data_s *dst, struct data_s *src)
return -ENOMEM;
}

- if (copy_from_user(dst->buf, src->buf, src->size)) {
+ p = (__force void __user *)src->buf;
+ if (copy_from_user(dst->buf, p, src->size)) {
kdelete(&dst->buf);
return -EFAULT;
}
--
2.5.2