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Subject[ 17/68] regset: Return -EFAULT, not -EIO, on host-side memory fault
3.0-stable review patch.  If anyone has any objections, please let me know.

------------------
From: "H. Peter Anvin" <hpa@zytor.com>

commit 5189fa19a4b2b4c3bec37c3a019d446148827717 upstream.

There is only one error code to return for a bad user-space buffer
pointer passed to a system call in the same address space as the
system call is executed, and that is EFAULT. Furthermore, the
low-level access routines, which catch most of the faults, return
EFAULT already.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@hack.frob.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
include/linux/regset.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/include/linux/regset.h
+++ b/include/linux/regset.h
@@ -339,7 +339,7 @@ static inline int copy_regset_to_user(st
return -EOPNOTSUPP;

if (!access_ok(VERIFY_WRITE, data, size))
- return -EIO;
+ return -EFAULT;

return regset->get(target, regset, offset, size, NULL, data);
}
@@ -365,7 +365,7 @@ static inline int copy_regset_from_user(
return -EOPNOTSUPP;

if (!access_ok(VERIFY_READ, data, size))
- return -EIO;
+ return -EFAULT;

return regset->set(target, regset, offset, size, NULL, data);
}



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