bna: use memdup_user to copy userspace buffers

Patch converts kzalloc->copy_from_user sequence to memdup_user. There
is also one useless assignment of NULL to bnad->regdata as it is followed
by assignment of kzalloc output.

Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
index 72c8955..ad7af5c 100644 (file)
--- a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
+++ b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
@@ -321,15 +321,10 @@ bnad_debugfs_write_regrd(struct file *file, const char __user *buf,
        unsigned long flags;
        void *kern_buf;
 
-       /* Allocate memory to store the user space buf */
-       kern_buf = kzalloc(nbytes, GFP_KERNEL);
-       if (!kern_buf)
-               return -ENOMEM;
-
-       if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
-               kfree(kern_buf);
-               return -ENOMEM;
-       }
+       /* Copy the user space buf */
+       kern_buf = memdup_user(buf, nbytes);
+       if (IS_ERR(kern_buf))
+               return PTR_ERR(kern_buf);
 
        rc = sscanf(kern_buf, "%x:%x", &addr, &len);
        if (rc < 2) {
@@ -341,7 +336,6 @@ bnad_debugfs_write_regrd(struct file *file, const char __user *buf,
 
        kfree(kern_buf);
        kfree(bnad->regdata);
-       bnad->regdata = NULL;
        bnad->reglen = 0;
 
        bnad->regdata = kzalloc(len << 2, GFP_KERNEL);
@@ -388,15 +382,10 @@ bnad_debugfs_write_regwr(struct file *file, const char __user *buf,
        unsigned long flags;
        void *kern_buf;
 
-       /* Allocate memory to store the user space buf */
-       kern_buf = kzalloc(nbytes, GFP_KERNEL);
-       if (!kern_buf)
-               return -ENOMEM;
-
-       if (copy_from_user(kern_buf, (void  __user *)buf, nbytes)) {
-               kfree(kern_buf);
-               return -ENOMEM;
-       }
+       /* Copy the user space buf */
+       kern_buf = memdup_user(buf, nbytes);
+       if (IS_ERR(kern_buf))
+               return PTR_ERR(kern_buf);
 
        rc = sscanf(kern_buf, "%x:%x", &addr, &val);
        if (rc < 2) {