[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>

1 files changed, 7 insertions, 3 deletions

diff --git a/arch/ia64/ia32/sys_ia32.c b/arch/ia64/ia32/sys_ia32.c
index d430d36ae49d..0afb4fe7c35b 100644
--- a/arch/ia64/ia32/sys_ia32.c
+++ b/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: