From: Kent Overstreet <kent.overstreet@linux.dev>
Date: Fri, 22 Sep 2023 18:19:52 +0000 (-0400)
Subject: bcachefs: Fix a null ptr deref in bch2_get_alloc_in_memory_pos()
X-Git-Tag: microblaze-v6.8~204^2~31
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=82142a5541063addd15c84fcda890675035df8aa;p=linux-2.6-microblaze.git

bcachefs: Fix a null ptr deref in bch2_get_alloc_in_memory_pos()

Reported-by: smatch
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---

diff --git a/fs/bcachefs/backpointers.c b/fs/bcachefs/backpointers.c
index 43defeaa1718..cc856150a948 100644
--- a/fs/bcachefs/backpointers.c
+++ b/fs/bcachefs/backpointers.c
@@ -703,7 +703,7 @@ static int bch2_get_alloc_in_memory_pos(struct btree_trans *trans,
 
 		--btree_nodes;
 		if (!btree_nodes) {
-			*end = alloc_k.k->p;
+			*end = alloc_k.k ? alloc_k.k->p : SPOS_MAX;
 			break;
 		}