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fs: fat: fix fatwrite overflow calculation

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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>
This commit is contained in:
Reno Farnesi 2017-08-13 15:16:17 -04:00 committed by Tom Rini
parent 528f2b66dc
commit 76216211f8
1 changed files with 1 additions and 1 deletions
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2
fs/fat/fat_write.c
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@ -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;
}