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5e7b138490
The disk_read() and disk_write() functions of the FAT driver use the blk_dread() and blk_dwrite() respectively. The blk_* APIs read and write to the devices in terms of the device block size. However, the FAT driver reads in terms of the device block size (from fat_set_blk_dev and read_bootsectandvi) and sector size in the rest of the places. This causes buffer overflows or partial reads when the FAT sector size is not equal to device block size. Fix this by using blk_dread in fat_set_blk_dev and read_bootsectandvi instead of disk_read. And update disk_read/disk_write to handle FAT sector size and block size mismatch. Tested on blksz | FAT sector size ------+---------------- 4096 | 4096 512 | 512 4096 | 512 512 | 4096 Signed-off-by: Varadarajan Narayanan <varadarajan.narayanan@oss.qualcomm.com>