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maple_tree: should get pivots boundary by type

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We should get pivots boundary by type.  Fixes a potential overindexing of
mt_pivots[].

Link: https://lkml.kernel.org/r/20221112234308.23823-1-richard.weiyang@gmail.com
Fixes: 54a611b605 ("Maple Tree: add new data structure")
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wei Yang 2022-11-12 23:43:08 +00:00 committed by Andrew Morton
parent 889a904fe3
commit ab6ef70a8b
1 changed files with 3 additions and 2 deletions
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5
lib/maple_tree.c
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@ -670,12 +670,13 @@ static inline unsigned long mte_pivot(const struct maple_enode *mn,
unsigned char piv)
{
struct maple_node *node = mte_to_node(mn);
enum maple_type type = mte_node_type(mn);
if (piv >= mt_pivots[piv]) {
if (piv >= mt_pivots[type]) {
WARN_ON(1);
return 0;
}
switch (mte_node_type(mn)) {
switch (type) {
case maple_arange_64:
return node->ma64.pivot[piv];
case maple_range_64: