From: Aaron Williams aaron.williams@caviumnetworks.com
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 --- include/fat.h | 6 +++--- 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;