[PATCH 2/4] fs: btrfs: volumes: prevent overflow for multiplying

[Tom Rini]

On Sat, Oct 31, 2020 at 09:07:50AM +0800, Qu Wenruo wrote:

> In __btrfs_map_block() we do a int * int and assign it to u64.
> This is not safe as the result (int * int) is still evaluated as (int)
> thus it can overflow.
> 
> Convert one of the multiplier to u64 to prevent such problem.
> 
> In real world, this should not cause problem as we have device number
> limit thus it won't go beyond 4G for a single stripe.
> 
> But it's harder to teach coverity about all these hidden limits, so just
> fix the possible overflow.
> 
> Reported-by: Coverity CID 312957
> Reported-by: Coverity CID 312948
> Signed-off-by: Qu Wenruo <wqu at suse.com>

Applied to u-boot/master, thanks!

-- 
Tom
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