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Message-ID: <20150131093637.GA29106@gondor.apana.org.au> Date: Sat, 31 Jan 2015 20:36:38 +1100 From: Herbert Xu <herbert@...dor.apana.org.au> To: Thomas Graf <tgraf@...g.ch>, netdev@...r.kernel.org Subject: rhashtable: Fix potential crash on destroy in rhashtable_shrink The current being_destroyed check in rhashtable_expand is not enough since if we start a shrinking process after freeing all elements in the table that's also going to crash. This patch adds a being_destroyed check to the deferred worker thread so that we bail out as soon as we take the lock. Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au> diff --git a/lib/rhashtable.c b/lib/rhashtable.c index 69a4eb0..4c3da1f 100644 --- a/lib/rhashtable.c +++ b/lib/rhashtable.c @@ -489,6 +489,9 @@ static void rht_deferred_worker(struct work_struct *work) ht = container_of(work, struct rhashtable, run_work); mutex_lock(&ht->mutex); + if (ht->being_destroyed) + goto unlock; + tbl = rht_dereference(ht->tbl, ht); list_for_each_entry(walker, &ht->walkers, list) @@ -499,6 +502,7 @@ static void rht_deferred_worker(struct work_struct *work) else if (ht->p.shrink_decision && ht->p.shrink_decision(ht, tbl->size)) rhashtable_shrink(ht); +unlock: mutex_unlock(&ht->mutex); } -- Email: Herbert Xu <herbert@...dor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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