From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx> commit 1202700c3f8cc5f7e4646c3cf05ee6f7c8bc6ccf upstream. If an invalidated maple state is encountered during write, reset the maple state to MAS_START. This will result in a re-walk of the tree to the correct location for the write. Link: https://lore.kernel.org/all/20230107020126.1627-1-sj@xxxxxxxxxx/ Link: https://lkml.kernel.org/r/20230120162650.984577-6-Liam.Howlett@xxxxxxxxxx Cc: <Stable@xxxxxxxxxxxxxxx> Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> Reported-by: SeongJae Park <sj@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- lib/maple_tree.c | 3 +++ 1 file changed, 3 insertions(+) --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5594,6 +5594,9 @@ static inline void mte_destroy_walk(stru static void mas_wr_store_setup(struct ma_wr_state *wr_mas) { + if (unlikely(mas_is_paused(wr_mas->mas))) + mas_reset(wr_mas->mas); + if (!mas_is_start(wr_mas->mas)) { if (mas_is_none(wr_mas->mas)) { mas_reset(wr_mas->mas);
