[PATCH] coda: switch to vmemdup_user()

[Yang Li]

Replace opencoded alloc and copy with vmemdup_user()

fixed the following coccicheck:
./fs/coda/psdev.c:125:10-18: WARNING opportunity for vmemdup_user

Reported-by: Abaci Robot <ab...@linux.alibaba.com>
Signed-off-by: Yang Li <yang....@linux.alibaba.com>
---
 fs/coda/psdev.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/fs/coda/psdev.c b/fs/coda/psdev.c
index 240669f..8d38e92 100644
--- a/fs/coda/psdev.c
+++ b/fs/coda/psdev.c
@@ -122,14 +122,9 @@ static ssize_t coda_psdev_write(struct file *file, const 
char __user *buf,
                                hdr.opcode, hdr.unique);
                        nbytes = size;
                }
-               dcbuf = kvmalloc(nbytes, GFP_KERNEL);
-               if (!dcbuf) {
-                       retval = -ENOMEM;
-                       goto out;
-               }
-               if (copy_from_user(dcbuf, buf, nbytes)) {
-                       kvfree(dcbuf);
-                       retval = -EFAULT;
+               dcbuf = vmemdup_user(buf, nbytes)
+               if (IS_ERR(dcbuf)) {
+                       r = PTR_ERR(dcbuf);
                        goto out;
                }
 
-- 
1.8.3.1