[PATCH 1/3] hostap: Use memdup_user() rather than duplicating its implementation

[SF Markus Elfring]

From: Markus Elfring <elfr...@users.sourceforge.net>
Date: Sat, 20 Aug 2016 18:19:43 +0200

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfr...@users.sourceforge.net>
---
 .../net/wireless/intersil/hostap/hostap_ioctl.c    | 22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/drivers/net/wireless/intersil/hostap/hostap_ioctl.c 
b/drivers/net/wireless/intersil/hostap/hostap_ioctl.c
index 3e5fa78..4e271f9 100644
--- a/drivers/net/wireless/intersil/hostap/hostap_ioctl.c
+++ b/drivers/net/wireless/intersil/hostap/hostap_ioctl.c
@@ -3041,14 +3041,9 @@ static int prism2_ioctl_priv_download(local_info_t 
*local, struct iw_point *p)
            p->length > 1024 || !p->pointer)
                return -EINVAL;
 
-       param = kmalloc(p->length, GFP_KERNEL);
-       if (param == NULL)
-               return -ENOMEM;
-
-       if (copy_from_user(param, p->pointer, p->length)) {
-               ret = -EFAULT;
-               goto out;
-       }
+       param = memdup_user(p->pointer, p->length);
+       if (IS_ERR(param))
+               return PTR_ERR(param);
 
        if (p->length < sizeof(struct prism2_download_param) +
            param->num_areas * sizeof(struct prism2_download_area)) {
@@ -3803,14 +3798,9 @@ static int prism2_ioctl_priv_hostapd(local_info_t 
*local, struct iw_point *p)
            p->length > PRISM2_HOSTAPD_MAX_BUF_SIZE || !p->pointer)
                return -EINVAL;
 
-       param = kmalloc(p->length, GFP_KERNEL);
-       if (param == NULL)
-               return -ENOMEM;
-
-       if (copy_from_user(param, p->pointer, p->length)) {
-               ret = -EFAULT;
-               goto out;
-       }
+       param = memdup_user(p->pointer, p->length);
+       if (IS_ERR(param))
+               return PTR_ERR(param);
 
        switch (param->cmd) {
        case PRISM2_SET_ENCRYPTION:
-- 
2.9.3