[Ocfs2-test-devel] [PATCH 42/59] mmap-test: fix segment fault

[Junxiao Bi]

When test file size is multiple of page size, there will be write out of
mmap range and cause segment fault.

Signed-off-by: Junxiao Bi <junxiao.bi at oracle.com>
---
 programs/mmap_test/mmap_test.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/programs/mmap_test/mmap_test.c b/programs/mmap_test/mmap_test.c
index 9edbb58..711bb81 100644
--- a/programs/mmap_test/mmap_test.c
+++ b/programs/mmap_test/mmap_test.c
@@ -80,6 +80,14 @@ int main(int argc, char *argv[])
     }
 
     offset = stat_buf.st_size % page_size;
+
+    /* fix offset if the file size is multiple of page size */
+    if (offset == 0)
+	    offset = page_size;
+
+    if (offset > stat_buf.st_size)
+	    offset = stat_buf.st_size;
+
     ptr = buf + (stat_buf.st_size - offset);
     remain = page_size - offset;
 
-- 
1.7.9.5