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>

...

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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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drivers/md/bcache/btree.c

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