Re: [PATCH] exfat: keep FITRIM within the requested range

Namjae Jeon <[email protected]>
Newsgroups dev.linux.lists.exfat,org.kernel.vger.linux-kernel
Message-ID <CAKYAXd-GfPRMB5RNfqu5q2AWFTy-qP_-Q3fWj7hv2sbFPi_L-w@mail.gmail.com> 
On Thu, Aug 13, 2026 at 11:29 PM Yang Wen <[email protected]> wrote:
>
> exfat_find_free_bitmap() searches the entire allocation bitmap and may
> wrap around to its beginning. exfat_trim_fs() does not verify that the
> returned cluster is still within the requested FITRIM range.
>
> As a result, a partial FITRIM operation may discard free clusters outside
> the user-specified range and report a trimmed length larger than the
> requested length.
>
> Validate each returned cluster against the requested range and stop the
> search when it wraps around or passes the range end.
>
> Signed-off-by: Yang Wen <[email protected]>
Applied it to #dev.
Thanks!
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