Martin Krause martin.krause@tqs.de writes:
The function find_sector() does not take into account if the flash bank has changed since the last call. This could lead to illegal accesses inside and beyond the flash_info_t info strcture. For example if the current flash bank has less sectors than the last used flash bank.
This patch adds two cheks. One that insures, that the current sector does not exceed the allowed maximum (which is always a good idea). And one that checks if the current access is to the same flash bank as the last access. If not, the search loop will start with sector 0.
Signed-off-by: Martin Krause martin.krause@tqs.de
drivers/mtd/cfi_flash.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c index dd394a8..0909fe7 100644 --- a/drivers/mtd/cfi_flash.c +++ b/drivers/mtd/cfi_flash.c @@ -744,8 +744,12 @@ static void flash_add_byte (flash_info_t * info, cfiword_t * cword, uchar c) static flash_sect_t find_sector (flash_info_t * info, ulong addr) { static flash_sect_t saved_sector = 0; /* previously found sector */
static flash_info_t *saved_info = 0; /* previously used flash bank */ flash_sect_t sector = saved_sector;
if ((info != saved_info) || (sector >= info->sector_count))
sector = 0;while ((info->start[sector] < addr) && (sector < info->sector_count - 1)) sector++;
@@ -757,6 +761,7 @@ static flash_sect_t find_sector (flash_info_t * info, ulong addr) sector--;
saved_sector = sector;
- saved_info = info; return sector;
}