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authorAaron Williams <aaron.williams@caviumnetworks.com>2012-05-19 07:20:40 +0000
committerWolfgang Denk <wd@denx.de>2012-05-22 10:14:05 +0200
commit1d90c3b457a64aa339aa900199e519ff08440778 (patch)
tree87ef15113c732a1c73d0ec885d7edcc48fd161e5
parenta075a79f98cc3f5972a2ed80551c0873217aef7d (diff)
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fat: fix FAT sector offsets overflow on large FAT partitions
This patch fixes several issues where sector offsets can overflow due to being limited to 16-bits. The cases where an overflow can happen when accessing large FAT32 partitions are: - length of FAT in sectors - start sector of root directory - the sector of the first cluster These issues were observed when reading files from a 64GB FAT32 filesystem. Signed-off-by: Aaron Williams <aaron.williams@caviumnetworks.com> Tested-by: Anatolij Gustschin <agust@denx.de> Signed-off-by: Anatolij Gustschin <agust@denx.de>
-rw-r--r--include/fat.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/fat.h b/include/fat.h
index 4c92442..f1b4a0d 100644
--- a/include/fat.h
+++ b/include/fat.h
@@ -178,12 +178,12 @@ typedef struct dir_slot {
typedef struct {
__u8 *fatbuf; /* Current FAT buffer */
int fatsize; /* Size of FAT in bits */
- __u16 fatlength; /* Length of FAT in sectors */
+ __u32 fatlength; /* Length of FAT in sectors */
__u16 fat_sect; /* Starting sector of the FAT */
- __u16 rootdir_sect; /* Start sector of root directory */
+ __u32 rootdir_sect; /* Start sector of root directory */
__u16 sect_size; /* Size of sectors in bytes */
__u16 clust_size; /* Size of clusters in sectors */
- short data_begin; /* The sector of the first cluster, can be negative */
+ int data_begin; /* The sector of the first cluster, can be negative */
int fatbufnum; /* Used by get_fatent, init to -1 */
} fsdata;