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bcache: Fix __bch_btree_node_alloc to make the failure behavior consistent

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In some specific situations, the return value of __bch_btree_node_alloc
may be NULL. This may lead to a potential NULL pointer dereference in
caller function like a calling chain :
btree_split->bch_btree_node_alloc->__bch_btree_node_alloc.

Fix it by initializing the return value in __bch_btree_node_alloc.

Fixes: cafe563591 ("bcache: A block layer cache")
Cc: stable@vger.kernel.org
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Signed-off-by: Coly Li <colyli@suse.de>
Link: https://lore.kernel.org/r/20230615121223.22502-6-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Zheng Wang 2023-06-15 20:12:22 +08:00 committed by Jens Axboe
parent 028ddcac47
commit 80fca8a10b
1 changed files with 3 additions and 1 deletions
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4
drivers/md/bcache/btree.c
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@ -1090,10 +1090,12 @@ struct btree *__bch_btree_node_alloc(struct cache_set *c, struct btree_op *op,
struct btree *parent)
{
BKEY_PADDED(key) k;
struct btree *b = ERR_PTR(-EAGAIN);
struct btree *b;
mutex_lock(&c->bucket_lock);
retry:
/* return ERR_PTR(-EAGAIN) when it fails */
b = ERR_PTR(-EAGAIN);
if (__bch_bucket_alloc_set(c, RESERVE_BTREE, &k.key, wait))
goto err;