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authorLiam R. Howlett <Liam.Howlett@oracle.com>2023-04-14 17:57:27 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-04-19 00:22:13 +0300
commit06e8fd999334bcd76b4d72d7b9206d4aea89764e (patch)
tree07ea252b9f0fad088ef0c4a22de9bbd057807461 /lib
parentfad8e4291da5e3243e086622df63cb952db444d8 (diff)
downloadlinux-06e8fd999334bcd76b4d72d7b9206d4aea89764e.tar.xz
maple_tree: fix mas_empty_area() search
The internal function of mas_awalk() was incorrectly skipping the last entry in a node, which could potentially be NULL. This is only a problem for the left-most node in the tree - otherwise that NULL would not exist. Fix mas_awalk() by using the metadata to obtain the end of the node for the loop and the logical pivot as apposed to the raw pivot value. Link: https://lkml.kernel.org/r/20230414145728.4067069-2-Liam.Howlett@oracle.com Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com> Reported-by: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/maple_tree.c20
1 files changed, 11 insertions, 9 deletions
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index d197b49eee67..1281a40d5735 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5056,10 +5056,10 @@ static inline bool mas_anode_descend(struct ma_state *mas, unsigned long size)
{
enum maple_type type = mte_node_type(mas->node);
unsigned long pivot, min, gap = 0;
- unsigned char offset;
- unsigned long *gaps;
- unsigned long *pivots = ma_pivots(mas_mn(mas), type);
- void __rcu **slots = ma_slots(mas_mn(mas), type);
+ unsigned char offset, data_end;
+ unsigned long *gaps, *pivots;
+ void __rcu **slots;
+ struct maple_node *node;
bool found = false;
if (ma_is_dense(type)) {
@@ -5067,13 +5067,15 @@ static inline bool mas_anode_descend(struct ma_state *mas, unsigned long size)
return true;
}
- gaps = ma_gaps(mte_to_node(mas->node), type);
+ node = mas_mn(mas);
+ pivots = ma_pivots(node, type);
+ slots = ma_slots(node, type);
+ gaps = ma_gaps(node, type);
offset = mas->offset;
min = mas_safe_min(mas, pivots, offset);
- for (; offset < mt_slots[type]; offset++) {
- pivot = mas_safe_pivot(mas, pivots, offset, type);
- if (offset && !pivot)
- break;
+ data_end = ma_data_end(node, type, pivots, mas->max);
+ for (; offset <= data_end; offset++) {
+ pivot = mas_logical_pivot(mas, pivots, offset, type);
/* Not within lower bounds */
if (mas->index > pivot)