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maple_tree: only root node could be deficient

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Each level's rightmost node should have (max == ULONG_MAX).  This means
current validation skips the right most node on each level.

Only the root node may be below the minimum data threshold.

Link: https://lkml.kernel.org/r/20241113031616.10530-4-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wei Yang 2024-11-13 03:16:16 +00:00 • committed by Andrew Morton
parent c38279d407
commit 7318f95ba4
1 changed files with 1 additions and 1 deletions
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2
lib/maple_tree.c
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@ -7556,7 +7556,7 @@ void mt_validate(struct maple_tree *mt)
MAS_WARN_ON(&mas, mte_dead_node(mas.node));
end = mas_data_end(&mas);
if (MAS_WARN_ON(&mas, (end < mt_min_slot_count(mas.node)) &&
(mas.max != ULONG_MAX))) {
(!mte_is_root(mas.node)))) {
pr_err("Invalid size %u of " PTR_FMT "\n",
end, mas_mn(&mas));
}