On (09/27/16 19:03), Sergey Senozhatsky wrote:
> Hello,
>
> On (09/27/16 16:40), Stephen Rothwell wrote:
> >
> > Changes since 20160923:
> >
>
> seems that commit e3b37f11e6e4e6b6 ("netfilter: replace list_head with
> single linked list") breaks the build on !CONFIG_NETFILTER_INGRESS systems
> accessing ->nf_hooks_ingress
>
> static void nf_set_hooks_head(struct net *net, const struct nf_hook_ops *reg,
> struct nf_hook_entry *entry)
> {
> switch (reg->pf) {
> case NFPROTO_NETDEV:
> /* We already checked in nf_register_net_hook() that this is
> * used from ingress.
> */
> rcu_assign_pointer(reg->dev->nf_hooks_ingress, entry);
> ^^^^^^^^^^^^^^^^^^^^
so I see two commits in linux-next now that fix the commit in question in
two patches
: commit 7816ec564ec40ae20bb7925f733a181cad0cc491 ("netfilter: accommodate
: different kconfig in nf_set_hooks_head")
:
: When CONFIG_NETFILTER_INGRESS is unset (or no), we need to handle
: the request for registration properly by dropping the hook. This
: releases the entry during the set.
:
: Fixes: e3b37f11e6e4 ("netfilter: replace list_head with single linked list")
and
: commit 5119e4381a90fabd3442bde02707cbd9e5d7367a ("netfilter: Fix potential
: null pointer dereference")
:
: It's possible for nf_hook_entry_head to return NULL. If two
: nf_unregister_net_hook calls happen simultaneously with a single hook
: entry in the list, both will enter the nf_hook_mutex critical section.
: The first will successfully delete the head, but the second will see
: this NULL pointer and attempt to dereference.
:
: This fix ensures that no null pointer dereference could occur when such
: a condition happens.
:
: Fixes: e3b37f11e6e4 ("netfilter: replace list_head with single linked list")
do you guys plan to fold those into "e3b37f11e6e4" (a preferred way)
or will send it out as 3 separate patches (um, why) ?
-ss
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