From c43aeb198048f64abda8655fdcdebe71cf1877ba Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 10 Jul 2017 07:40:49 -0400
Subject: [PATCH] fix brown paperbag bug in inlined copy_..._iter()
"copied nothing" == "return 0", not "return full size".
Fixes: aa28de275a24 "iov_iter/hardening: move object size checks to inlined part"
Spotted-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
include/linux/uio.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/include/linux/uio.h b/include/linux/uio.h
index 342d2dc225b9..8a642cda641c 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -103,7 +103,7 @@ static __always_inline __must_check
size_t copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
{
if (unlikely(!check_copy_size(addr, bytes, true)))
- return bytes;
+ return 0;
else
return _copy_to_iter(addr, bytes, i);
}
@@ -112,7 +112,7 @@ static __always_inline __must_check
size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
{
if (unlikely(!check_copy_size(addr, bytes, false)))
- return bytes;
+ return 0;
else
return _copy_from_iter(addr, bytes, i);
}
@@ -130,7 +130,7 @@ static __always_inline __must_check
size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
{
if (unlikely(!check_copy_size(addr, bytes, false)))
- return bytes;
+ return 0;
else
return _copy_from_iter_nocache(addr, bytes, i);
}
@@ -160,7 +160,7 @@ static __always_inline __must_check
size_t copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i)
{
if (unlikely(!check_copy_size(addr, bytes, false)))
- return bytes;
+ return 0;
else
return _copy_from_iter_flushcache(addr, bytes, i);
}