compat: return -EFAULT on error in waitid()

The copy_to_user() call returns the number of bytes remaining but we
want to return -EFAULT on error.

Fixes "x32: fix waitid()"

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/compat.c b/kernel/compat.c
index 36700e9..f4bddb9 100644 (file)
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -593,7 +593,7 @@ COMPAT_SYSCALL_DEFINE5(waitid,
                else
                        ret = put_compat_rusage(&ru, uru);
                if (ret)
-                       return ret;
+                       return -EFAULT;
        }
 
        BUG_ON(info.si_code & __SI_MASK);