[lkml]   [2018]   [Oct]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 4.18 157/228] uaccess: Fix is_source param for check_copy_size() in copy_to_iter_mcsafe()
4.18-stable review patch.  If anyone has any objections, please let me know.


From: Dave Jiang <>

commit dfb06cba8c73c0704710b2e3fbe2c35ac66a01b4 upstream.

copy_to_iter_mcsafe() is passing in the is_source parameter as "false"
to check_copy_size(). This is different than what copy_to_iter() does.
Also, the addr parameter passed to check_copy_size() is the source so
therefore we should be passing in "true" instead.

Fixes: 8780356ef630 ("x86/asm/memcpy_mcsafe: Define copy_to_iter_mcsafe()")
Cc: <>
Reported-by: Fan Du <>
Signed-off-by: Dave Jiang <>
Reviewed-by: Vishal Verma <>
Reported-by: Wenwei Tao <>
Signed-off-by: Dan Williams <>
Signed-off-by: Greg Kroah-Hartman <>

include/linux/uio.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -172,7 +172,7 @@ size_t copy_from_iter_flushcache(void *a
static __always_inline __must_check
size_t copy_to_iter_mcsafe(void *addr, size_t bytes, struct iov_iter *i)
- if (unlikely(!check_copy_size(addr, bytes, false)))
+ if (unlikely(!check_copy_size(addr, bytes, true)))
return 0;
return _copy_to_iter_mcsafe(addr, bytes, i);

 \ /
  Last update: 2018-10-02 16:03    [W:0.372 / U:1.408 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site