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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-12-16 18:13:14 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-12-16 10:44:08 -0500 |
| commit | 3a324606bbabfc30084ce9d08169910773ba9a92 (patch) | |
| tree | 3561b143a3f0c9036cd6e9b9e5e3adc95208846a | |
| parent | 887dc9f2cef6e98dcccf807da5e6faf4f60ba483 (diff) | |
| download | linux-3a324606bbabfc30084ce9d08169910773ba9a92.tar.gz linux-3a324606bbabfc30084ce9d08169910773ba9a92.tar.bz2 linux-3a324606bbabfc30084ce9d08169910773ba9a92.zip | |
rhashtable: Enforce minimum size on initial hash table
William Hua <william.hua@canonical.com> wrote:
>
> I wasn't aware there was an enforced minimum size. I simply set the
> nelem_hint in the rhastable_params struct to 1, expecting it to grow as
> needed. This caused a segfault afterwards when trying to insert an
> element.
OK we're doing the size computation before we enforce the limit
on min_size.
---8<---
We need to do the initial hash table size computation after we
have obtained the correct min_size/max_size parameters. Otherwise
we may end up with a hash table whose size is outside the allowed
envelope.
Fixes: a998f712f77e ("rhashtable: Round up/down min/max_size to...")
Reported-by: William Hua <william.hua@canonical.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | lib/rhashtable.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c index 2ff7ed91663a..a98e71db7dd2 100644 --- a/lib/rhashtable.c +++ b/lib/rhashtable.c @@ -738,9 +738,6 @@ int rhashtable_init(struct rhashtable *ht, if (params->nulls_base && params->nulls_base < (1U << RHT_BASE_SHIFT)) return -EINVAL; - if (params->nelem_hint) - size = rounded_hashtable_size(params); - memset(ht, 0, sizeof(*ht)); mutex_init(&ht->mutex); spin_lock_init(&ht->lock); @@ -760,6 +757,9 @@ int rhashtable_init(struct rhashtable *ht, ht->p.min_size = max(ht->p.min_size, HASH_MIN_SIZE); + if (params->nelem_hint) + size = rounded_hashtable_size(&ht->p); + /* The maximum (not average) chain length grows with the * size of the hash table, at a rate of (log N)/(log log N). * The value of 16 is selected so that even if the hash |