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- fix race condition in dm-cache-policy-smq

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Merge tag 'for-7.1/dm-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fix from Mikulas Patocka:

 - fix race condition in dm-cache-policy-smq

* tag 'for-7.1/dm-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm cache policy smq: check allocation under invalidate lock
This commit is contained in:
Linus Torvalds 2026-06-01 19:55:30 -07:00
commit 6f3ed7fec7
1 changed files with 8 additions and 4 deletions
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12
drivers/md/dm-cache-policy-smq.c
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@ -1590,18 +1590,22 @@ static int smq_invalidate_mapping(struct dm_cache_policy *p, dm_cblock_t cblock)
struct smq_policy *mq = to_smq_policy(p);
struct entry *e = get_entry(&mq->cache_alloc, from_cblock(cblock));
unsigned long flags;
if (!e->allocated)
return -ENODATA;
int r = 0;
spin_lock_irqsave(&mq->lock, flags);
if (!e->allocated) {
r = -ENODATA;
goto out;
}
// FIXME: what if this block has pending background work?
del_queue(mq, e);
h_remove(&mq->table, e);
free_entry(&mq->cache_alloc, e);
out:
spin_unlock_irqrestore(&mq->lock, flags);
return 0;
return r;
}
static uint32_t smq_get_hint(struct dm_cache_policy *p, dm_cblock_t cblock)