Commit 65be6f05 authored by Liam R. Howlett's avatar Liam R. Howlett Committed by Andrew Morton
Browse files

maple_tree: fix potential rcu issue 

Ensure the node isn't dead after reading the node end.

Link: https://lkml.kernel.org/r/20230120162650.984577-3-Liam.Howlett@oracle.com


Signed-off-by: default avatarLiam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent e7f43ca9

lib/maple_tree.c

+1 −1
Original line number Diff line number Diff line
@@ -4655,13 +4655,13 @@ static inline void *mas_next_nentry(struct ma_state *mas, 
	pivots = ma_pivots(node, type);

	slots = ma_slots(node, type);

	mas->index = mas_safe_min(mas, pivots, mas->offset);

	count = ma_data_end(node, type, pivots, mas->max);

	if (ma_dead_node(node))

		return NULL;



	if (mas->index > max)

		return NULL;



	count = ma_data_end(node, type, pivots, mas->max);

	if (mas->offset > count)

		return NULL;