From 72e0cb91c890ffe4a6c7df4b79fb02009f61e00b Mon Sep 17 00:00:00 2001
From: relan <relan@users.noreply.github.com>
Date: Sun, 23 Feb 2014 11:23:55 +0000
Subject: [PATCH 1/1] Check device size on mount.

---
 libexfat/mount.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/libexfat/mount.c b/libexfat/mount.c
index c161372..70c8af5 100644
--- a/libexfat/mount.c
+++ b/libexfat/mount.c
@@ -24,6 +24,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <errno.h>
+#include <inttypes.h>
 #include <unistd.h>
 #include <sys/types.h>
 
@@ -252,6 +253,18 @@ int exfat_mount(struct exfat* ef, const char* spec, const char* options)
 		free(ef->sb);
 		return -EIO;
 	}
+	if (le64_to_cpu(ef->sb->sector_count) * SECTOR_SIZE(*ef->sb) >
+			exfat_get_size(ef->dev))
+	{
+		free(ef->zero_cluster);
+		exfat_error("file system is larger than underlying device: "
+				"%"PRIu64" > %"PRIu64,
+				le64_to_cpu(ef->sb->sector_count) * SECTOR_SIZE(*ef->sb),
+				exfat_get_size(ef->dev));
+		exfat_close(ef->dev);
+		free(ef->sb);
+		return -EIO;
+	}
 
 	ef->root = malloc(sizeof(struct exfat_node));
 	if (ef->root == NULL)
-- 
2.11.0