From: Debian PHP Maintainers <pkg-php-maint@lists.alioth.debian.org>
Date: Sat, 2 May 2015 10:26:54 +0200
Subject: lp564920-fix-big-files

---
 main/streams/plain_wrapper.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/main/streams/plain_wrapper.c b/main/streams/plain_wrapper.c
index 131f77c..018ff2f 100644
--- a/main/streams/plain_wrapper.c
+++ b/main/streams/plain_wrapper.c
@@ -691,7 +691,13 @@ static int php_stdiop_set_option(php_stream *stream, int option, int value, void
 
 				switch (value) {
 					case PHP_STREAM_MMAP_SUPPORTED:
-						return fd == -1 ? PHP_STREAM_OPTION_RETURN_ERR : PHP_STREAM_OPTION_RETURN_OK;
+						if (fd == -1)
+							return PHP_STREAM_OPTION_RETURN_ERR;
+						/* Don't mmap large files */
+						do_fstat(data, 1);
+						if (data->sb.st_size > 4 * 1024 * 1024)
+							return PHP_STREAM_OPTION_RETURN_ERR;
+						return PHP_STREAM_OPTION_RETURN_OK;
 
 					case PHP_STREAM_MMAP_MAP_RANGE:
 						if (do_fstat(data, 1) != 0) {