+ mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: mm: change fault_in_pages_* to have an unsigned size parameter
has been added to the -mm tree.  Its filename is
     mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter.patch

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------------------------------------------------------
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: mm: change fault_in_pages_* to have an unsigned size parameter

fault_in_pages_writeable() and fault_in_pages_readable() treat the size
parameter as unsigned, doing pointer math with the value, so make this
explicit and set it to be a size_t type which all callers currently treat
it as anyway.

This solves the issue where static checkers get nervous seeing pointer
arithmetic happening with a signed value.

Link: https://lkml.kernel.org/r/20210727111136.457638-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reported-by: Jordy Zomer <jordy@pwning.systems>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: David Howells <dhowells@redhat.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: "Darrick J. Wong" <djwong@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/pagemap.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/include/linux/pagemap.h~mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter
+++ a/include/linux/pagemap.h
@@ -786,7 +786,7 @@ extern void add_page_wait_queue(struct p
 /*
  * Fault everything in given userspace address range in.
  */
-static inline int fault_in_pages_writeable(char __user *uaddr, int size)
+static inline int fault_in_pages_writeable(char __user *uaddr, size_t size)
 {
 	char __user *end = uaddr + size - 1;
 
@@ -813,7 +813,7 @@ static inline int fault_in_pages_writeab
 	return 0;
 }
 
-static inline int fault_in_pages_readable(const char __user *uaddr, int size)
+static inline int fault_in_pages_readable(const char __user *uaddr, size_t size)
 {
 	volatile char c;
 	const char __user *end = uaddr + size - 1;
_

Patches currently in -mm which might be from gregkh@linuxfoundation.org are

mm-change-fault_in_pages_-to-have-an-unsigned-size-parameter.patch
percpu-remove-export-of-pcpu_base_addr.patch