[U-Boot] fs: fat: fix fatwrite overflow calculation

Tom Rini
2017-08-26T20:45:30Z

On Sun, Aug 13, 2017 at 03:16:17PM -0400, Reno Farnesi wrote:

> 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>

Applied to u-boot/master, thanks!

--
Tom
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