This patch fixes several issues where sector offsets can overflow due to
being limited to 16-bits. There are many cases which can cause an
overflow, including large FAT32 partitions and partitions that start at
a sufficiently large offset on the storage device.
Numerous issues were observed and fixed when a 64GB FAT32 filesystem was
accessed due to truncation.
Signed-off-by: Aaron Williams <aaron.willi...@caviumnetworks.com>
---
include/fat.h | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/include/fat.h b/include/fat.h
index 4c92442..7215628 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 */
- __u16 fat_sect; /* Starting sector of the FAT */
- __u16 rootdir_sect; /* Start sector of root directory */
- __u16 sect_size; /* Size of sectors in bytes */
+ __u32 fat_sect; /* Starting sector of the FAT */
+ __u32 rootdir_sect; /* Start sector of root directory */
+ __u32 fatlength; /* Length of FAT in sectors */
__u16 clust_size; /* Size of clusters in sectors */
- short data_begin; /* The sector of the first cluster, can be
negative */
+ __u16 sect_size; /* Size of sectors in bytes */
+ int data_begin; /* The sector of the first cluster, can be
negative */
int fatbufnum; /* Used by get_fatent, init to -1 */
} fsdata;
--
1.7.7
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