diff options
Diffstat (limited to 'firmware/drivers')
-rw-r--r-- | firmware/drivers/fat.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/firmware/drivers/fat.c b/firmware/drivers/fat.c index fed3baffd4..b14e461a65 100644 --- a/firmware/drivers/fat.c +++ b/firmware/drivers/fat.c | |||
@@ -391,7 +391,12 @@ static int bpb_is_sane(struct bpb *fat_bpb) | |||
391 | return -1; | 391 | return -1; |
392 | } | 392 | } |
393 | 393 | ||
394 | if (fat_bpb->bpb_secperclus * fat_bpb->bpb_bytspersec > 128*1024ul) | 394 | /* The fat_bpb struct does not hold the raw value of bpb_bytspersec, the |
395 | * value is multiplied in cases where bpb_bytspersec != SECTOR_SIZE. We need | ||
396 | * to undo that multiplication before we do the sanity check. */ | ||
397 | unsigned long secmult = fat_bpb->bpb_bytspersec / SECTOR_SIZE; | ||
398 | |||
399 | if (fat_bpb->bpb_secperclus * fat_bpb->bpb_bytspersec / secmult > 128*1024ul) | ||
395 | { | 400 | { |
396 | DEBUGF("%s() - Error: cluster size is larger than 128K " | 401 | DEBUGF("%s() - Error: cluster size is larger than 128K " |
397 | "(%lu * %lu = %lu)\n", __func__, | 402 | "(%lu * %lu = %lu)\n", __func__, |