commit 706186d266d45c161f9dad3ec1851c78017bc1de
author Daniel Micay <danielmicay@gmail.com> Tue Nov 03 05:30:29 2015 -0500
committer Daniel Micay <danielmicay@gmail.com> Tue Nov 03 05:30:29 2015 -0500
tree 6639e7bfff39c3dc48e4cee8caf7b1abb4407997
parent e07558fb80da4e196e8b7e371041c1e75c56b29b

fix PTRDIFF_MAX check in the 32-bit mmap wrapper

It wasn't making use of the page-rounded size.

Change-Id: I911345fcfd6419a4dbc18a4622b42e1b76729abb

libc/bionic/mmap.cpp

diff --git a/libc/bionic/mmap.cpp b/libc/bionic/mmap.cpp
index 794f50f..9bc80a2 100644
--- a/libc/bionic/mmap.cpp
+++ b/libc/bionic/mmap.cpp
@@ -48,7 +48,7 @@
 
   // prevent allocations large enough for `end - start` to overflow
   size_t rounded = BIONIC_ALIGN(size, PAGE_SIZE);
-  if (rounded < size || size > PTRDIFF_MAX) {
+  if (rounded < size || rounded > PTRDIFF_MAX) {
     errno = ENOMEM;
     return MAP_FAILED;
   }