This is a note to let you know that I've just added the patch titled
bcache: Remove unnecessary NULL point check in node allocations
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bcache-remove-unnecessary-null-point-check-in-node-allocations.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 028ddcac477b691dd9205c92f991cc15259d033e Mon Sep 17 00:00:00 2001
From: Zheng Wang <zyytlz.wz@xxxxxxx>
Date: Thu, 15 Jun 2023 20:12:21 +0800
Subject: bcache: Remove unnecessary NULL point check in node allocations
From: Zheng Wang <zyytlz.wz@xxxxxxx>
commit 028ddcac477b691dd9205c92f991cc15259d033e upstream.
Due to the previous fix of __bch_btree_node_alloc, the return value will
never be a NULL pointer. So IS_ERR is enough to handle the failure
situation. Fix it by replacing IS_ERR_OR_NULL check by an IS_ERR check.
Fixes: cafe56359144 ("bcache: A block layer cache")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
Signed-off-by: Coly Li <colyli@xxxxxxx>
Link: https://lore.kernel.org/r/20230615121223.22502-5-colyli@xxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/bcache/btree.c | 10 +++++-----
drivers/md/bcache/super.c | 4 ++--
2 files changed, 7 insertions(+), 7 deletions(-)
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -1174,7 +1174,7 @@ static struct btree *btree_node_alloc_re
{
struct btree *n = bch_btree_node_alloc(b->c, op, b->level, b->parent);
- if (!IS_ERR_OR_NULL(n)) {
+ if (!IS_ERR(n)) {
mutex_lock(&n->write_lock);
bch_btree_sort_into(&b->keys, &n->keys, &b->c->sort);
bkey_copy_key(&n->key, &b->key);
@@ -1377,7 +1377,7 @@ 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_OR_NULL(r[nodes].b))
+ while (nodes < GC_MERGE_NODES && !IS_ERR(r[nodes].b))
keys += r[nodes++].keys;
blocks = btree_default_blocks(b->c) * 2 / 3;
@@ -1389,7 +1389,7 @@ static int btree_gc_coalesce(struct btre
for (i = 0; i < nodes; i++) {
new_nodes[i] = btree_node_alloc_replacement(r[i].b, NULL);
- if (IS_ERR_OR_NULL(new_nodes[i]))
+ if (IS_ERR(new_nodes[i]))
goto out_nocoalesce;
}
@@ -1524,7 +1524,7 @@ out_nocoalesce:
atomic_dec(&b->c->prio_blocked);
for (i = 0; i < nodes; i++)
- if (!IS_ERR_OR_NULL(new_nodes[i])) {
+ if (!IS_ERR(new_nodes[i])) {
btree_node_free(new_nodes[i]);
rw_unlock(true, new_nodes[i]);
}
@@ -1706,7 +1706,7 @@ static int bch_btree_gc_root(struct btre
if (should_rewrite) {
n = btree_node_alloc_replacement(b, NULL);
- if (!IS_ERR_OR_NULL(n)) {
+ if (!IS_ERR(n)) {
bch_btree_node_write_sync(n);
bch_btree_set_root(n);
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1576,7 +1576,7 @@ static void cache_set_flush(struct closu
if (!IS_ERR_OR_NULL(c->gc_thread))
kthread_stop(c->gc_thread);
- if (!IS_ERR_OR_NULL(c->root))
+ if (!IS_ERR(c->root))
list_add(&c->root->list, &c->btree_cache);
/* Should skip this if we're unregistering because of an error */
@@ -1921,7 +1921,7 @@ static int run_cache_set(struct cache_se
err = "cannot allocate new btree root";
c->root = __bch_btree_node_alloc(c, NULL, 0, true, NULL);
- if (IS_ERR_OR_NULL(c->root))
+ if (IS_ERR(c->root))
goto err;
mutex_lock(&c->root->write_lock);
Patches currently in stable-queue which might be from zyytlz.wz@xxxxxxx are
queue-4.19/bcache-remove-unnecessary-null-point-check-in-node-allocations.patch
queue-4.19/fbdev-imsttfb-fix-use-after-free-bug-in-imsttfb_probe.patch
