[IA64] sync compat getdents

Add VERIFY_WRITE check in the beginning like compat_sys_getdents() (EINVAL vs
EFAULT).

Signed-off-by: Alexandr Andreev <aandreev@openvz.org>
Signed-off-by: Alexey Dobriyan <adobriyan@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/ia32/sys_ia32.c

@@ -1267,6 +1267,10 @@ sys32_getdents (unsigned int fd, struct compat_dirent __user *dirent, unsigned i
 	struct getdents32_callback buf;
 	int error;
 
+	error = -EFAULT;
+	if (!access_ok(VERIFY_WRITE, dirent, count))
+		goto out;
+
 	error = -EBADF;
 	file = fget(fd);
 	if (!file)
@@ -1283,10 +1287,10 @@ sys32_getdents (unsigned int fd, struct compat_dirent __user *dirent, unsigned i
 	error = buf.error;
 	lastdirent = buf.previous;
 	if (lastdirent) {
-		error = -EINVAL;
 		if (put_user(file->f_pos, &lastdirent->d_off))
-			goto out_putf;
-		error = count - buf.count;
+			error = -EFAULT;
+		else
+			error = count - buf.count;
 	}
 
 out_putf: