diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-12-16 18:13:14 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-01-22 20:54:16 -0800 |
| commit | 78e1970233fd270349834bb8b7ca84c58c7c974c (patch) | |
| tree | f2b014af5bde3352552c38c9a253859d38f98a3d /lib | |
| parent | abf79193eb35f1786a3e22fda24cb6cd32b0083b (diff) | |
rhashtable: Enforce minimum size on initial hash table
[ Upstream commit 3a324606bbabfc30084ce9d08169910773ba9a92 ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
| -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 cf910e48f8f2..4ff003e1d965 100644 --- a/lib/rhashtable.c +++ b/lib/rhashtable.c @@ -730,9 +730,6 @@ 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); @@ -752,6 +749,9 @@ 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 |