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server/worker_task: fix panic on slice range when index is empty

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since len() and MAX_INDEX_TASKS are both usize, they underflow
instead of getting negative values

instead check the sizes and set them accordingly

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2020-09-29 12:22:02 +02:00 committed by Dietmar Maurer
parent 9a76091785
commit 7eebe1483e
1 changed files with 13 additions and 2 deletions
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15
src/server/worker_task.rs
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@ -418,9 +418,20 @@ fn update_active_workers(new_upid: Option<&UPID>) -> Result<(), Error> {
}
});
let start = (finish_list.len()-MAX_INDEX_TASKS).max(0);
let start = if finish_list.len() > MAX_INDEX_TASKS {
finish_list.len() - MAX_INDEX_TASKS
} else {
0
};
let end = (start+MAX_INDEX_TASKS).min(finish_list.len());
let index_raw = render_task_list(&finish_list[start..end]);
let index_raw = if end > start {
render_task_list(&finish_list[start..end])
} else {
"".to_string()
};
replace_file(
PROXMOX_BACKUP_INDEX_TASK_FN,