From: Liam R. Howlett <Liam.Howlett@oracle.com>
Date: Wed, 17 Sep 2025 01:00:50 +0000 (-0400)
Subject: multi_dst_setup: Fix split size and data off by one
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=31c29dea9726ba45bba620f151093c421cf53e54;p=users%2Fjedix%2Flinux-maple.git

multi_dst_setup: Fix split size and data off by one

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

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 633ee584e755..0a0ea2bf0ab5 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -3128,14 +3128,14 @@ void multi_dst_setup(struct maple_copy *cp, struct ma_state *mas,
 	/* Data is 1 indexed, every src has +1 added.  */
 
 	if (cp->data <= mt_slots[mt]) {
-		cp->split = cp->data;
+		cp->split = cp->data - 1;
 		cp->d_count = 1;
 		goto node_setup;
 	}
 
-	cp->split = cp->data / 2;
+	cp->split = (cp->data - 1) / 2;
 	cp->d_count = 2;
-	if (cp->data < mt_slots[mt] * 2) {
+	if (cp->data - 1 < mt_slots[mt] * 2) {
 		unsigned char off;
 		unsigned char s;