From: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Date: Fri, 20 Jul 2012 13:19:29 +0000 (+0200)
Subject: FAT: get_fatent: Fix FAT boundary check
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=8006dd2e57a9b30ff1c978e76c0dcd28d9786ce8;p=u-boot.git

FAT: get_fatent: Fix FAT boundary check

startblock must be taken into account in order not to read past the
end of the FAT.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Wolfgang Denk <wd@denx.de>
---

diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 9f83572524..87a1623d19 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -207,8 +207,8 @@ static __u32 get_fatent(fsdata *mydata, __u32 entry)
 		__u32 fatlength = mydata->fatlength;
 		__u32 startblock = bufnum * FATBUFBLOCKS;
 
-		if (getsize > fatlength)
-			getsize = fatlength;
+		if (startblock + getsize > fatlength)
+			getsize = fatlength - startblock;
 
 		fatlength *= mydata->sect_size;	/* We want it in bytes now */
 		startblock += mydata->fat_sect;	/* Offset from start of disk */