[PATCH v2 05/10] liveupdate: Don't WARN if tracking a retrieved file fails

[sashiko-bot at kernel.org]

> Handle a failure to add a retrieved file to luo_preserved_files instead
> of triggering a WARN_ON(). xa_insert() can fail with -ENOMEM, and
> userspace can trigger that with LIVEUPDATE_SESSION_RETRIEVE_FD, so
> warning about it lets userspace crash systems with panic_on_warn.
> 
> The handler has already consumed the preserved state when this happens,
> so make the failure permanent. Keep the file until the file set is
> finished, like any other retrieved file, so that its resources are not
> released before then. Finishing the file set then erases the file from
> luo_preserved_files, which does nothing for a file that was never added.
> 
> Fixes: 00d0b372374f ("liveupdate: prevent double management of files")
> Assisted-by: LLM
> Signed-off-by: David Matlack <dmatlack at google.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261022225035.377445-1-dmatlack@google.com?part=5