Hi,
On Wed, 15 Feb 2017, Vishwanath Pai wrote:
> If we use before/after to add an element to an empty list it will cause
> a kernel panic.
>
> $> cat crash.restore
> create a hash:ip
> create b hash:ip
> create test list:set timeout 5 size 4
> add test b before a
>
> $> ipset -R < crash.restore
>
> Executing the above will crash the kernel.
>
> Signed-off-by: Vishwanath Pai <v...@akamai.com>
> Reviewed-by: Josh Hunt <joh...@akamai.com>
> ---
> net/netfilter/ipset/ip_set_list_set.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/net/netfilter/ipset/ip_set_list_set.c
> b/net/netfilter/ipset/ip_set_list_set.c
> index 51077c5..178d4eb 100644
> --- a/net/netfilter/ipset/ip_set_list_set.c
> +++ b/net/netfilter/ipset/ip_set_list_set.c
> @@ -260,11 +260,14 @@ struct list_set {
> else
> prev = e;
> }
> +
> + /* If before/after is used on an empty set */
> + if ((d->before > 0 && !next) ||
> + (d->before < 0 && !prev))
> + return -IPSET_ERR_REF_EXIST;
> +
> /* Re-add already existing element */
> if (n) {
> - if ((d->before > 0 && !next) ||
> - (d->before < 0 && !prev))
> - return -IPSET_ERR_REF_EXIST;
> if (!flag_exist)
> return -IPSET_ERR_EXIST;
> /* Update extensions */
> --
> 1.9.1
Patch is applied, thank you!
Best regards,
Jozsef
-
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