4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Coly Li <colyli@xxxxxxx>
commit f72f4312d4388376fc8a1f6cf37cb21a0d41758b upstream.
Commit 028ddcac477b ("bcache: Remove unnecessary NULL point check in
node allocations") do the following change inside btree_gc_coalesce(),
31 @@ -1340,7 +1340,7 @@ static int btree_gc_coalesce(
32 memset(new_nodes, 0, sizeof(new_nodes));
33 closure_init_stack(&cl);
34
35 - while (nodes < GC_MERGE_NODES && !IS_ERR_OR_NULL(r[nodes].b))
36 + while (nodes < GC_MERGE_NODES && !IS_ERR(r[nodes].b))
37 keys += r[nodes++].keys;
38
39 blocks = btree_default_blocks(b->c) * 2 / 3;
At line 35 the original r[nodes].b is not always allocatored from
__bch_btree_node_alloc(), and possibly initialized as NULL pointer by
caller of btree_gc_coalesce(). Therefore the change at line 36 is not
correct.
This patch replaces the mistaken IS_ERR() by IS_ERR_OR_NULL() to avoid
potential issue.
Fixes: 028ddcac477b ("bcache: Remove unnecessary NULL point check in node allocations")
Cc: <stable@xxxxxxxxxxxxxxx> # 6.5+
Cc: Zheng Wang <zyytlz.wz@xxxxxxx>
Signed-off-by: Coly Li <colyli@xxxxxxx>
Link: https://lore.kernel.org/r/20231120052503.6122-9-colyli@xxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/bcache/btree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -1379,7 +1379,7 @@ static int btree_gc_coalesce(struct btre
memset(new_nodes, 0, sizeof(new_nodes));
closure_init_stack(&cl);
- while (nodes < GC_MERGE_NODES && !IS_ERR(r[nodes].b))
+ while (nodes < GC_MERGE_NODES && !IS_ERR_OR_NULL(r[nodes].b))
keys += r[nodes++].keys;
blocks = btree_default_blocks(b->c) * 2 / 3;
