fs: fat: fix fatwrite overflow calculation

The overflow calculation was incorrect. Adding the start block of the
partition is not needed because the sectors are already relative to the
beginning of the partition. If you attempted to write a file smaller
than cur_part_info.start blocks on a full partition the old calculation
fails to catch the overflow. This would cause an infinite loop in the
determine_fatent function.

Old, incorrect calculation:

ending sector of new file = start sector + file size (in sectors)
last sector = partition start + total sectors on the partition

Adding the partition start block number is not needed because sectors
are already relative to the start of the partition.

New calculation:

ending sector of new file = start sector + file size (in sectors)
last sector = total sectors on the partition

Signed-off-by: Reno Farnesi <nfarnesi4@gmail.com>

diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index f6f06289f406c3905676524f57d4c0ef6997993d..4ca024c2088038562f17e5904c46eacb1edc4518 100644 (file)
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -762,7 +762,7 @@ static int check_overflow(fsdata *mydata, __u32 clustnum, loff_t size)
        if (offset != 0)
                sect_num++;
 
-       if (startsect + sect_num > cur_part_info.start + total_sector)
+       if (startsect + sect_num > total_sector)
                return -1;
        return 0;
 }