From: Liam R. Howlett <Liam.Howlett@oracle.com>
Date: Thu, 3 Mar 2022 03:36:59 +0000 (-0500)
Subject: maple_tree: Fix extend_null overflow
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ed96dc9718ad06cbe3a05a3879ea8ab13606d58b;p=users%2Fjedix%2Flinux-maple.git

maple_tree: Fix extend_null overflow

Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
---

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index a53dc391f055..f1fdb441ead7 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -4113,6 +4113,7 @@ static inline void mas_wr_extend_null(struct ma_wr_state *wr_mas)
 
 	/* Check next slot(s) if we are overwriting the end */
 	if ((mas->last == wr_mas->end_piv) &&
+	    (wr_mas->node_end != wr_mas->offset_end) &&
 	    !wr_mas->slots[wr_mas->offset_end + 1]) {
 		wr_mas->offset_end++;
 		if (wr_mas->offset_end == wr_mas->node_end)