This is a note to let you know that I've just added the patch titled
netfilter: nf_tables: fix memleak when more than 255 elements expired
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
netfilter-nf_tables-fix-memleak-when-more-than-255-e.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 473b0cf242792b6c3b99987908e284293c768965
Author: Florian Westphal <fw@xxxxxxxxx>
Date: Fri Sep 22 18:30:29 2023 +0200
netfilter: nf_tables: fix memleak when more than 255 elements expired
commit cf5000a7787cbc10341091d37245a42c119d26c5 upstream.
When more than 255 elements expired we're supposed to switch to a new gc
container structure.
This never happens: u8 type will wrap before reaching the boundary
and nft_trans_gc_space() always returns true.
This means we recycle the initial gc container structure and
lose track of the elements that came before.
While at it, don't deref 'gc' after we've passed it to call_rcu.
Fixes: 5f68718b34a5 ("netfilter: nf_tables: GC transaction API to avoid race with control plane")
Reported-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index eb2103a9a7dd9..05d7a60a0e1f3 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1657,7 +1657,7 @@ struct nft_trans_gc {
struct net *net;
struct nft_set *set;
u32 seq;
- u8 count;
+ u16 count;
void *priv[NFT_TRANS_GC_BATCHCOUNT];
struct rcu_head rcu;
};
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 6e67fb999a256..b22f2d9ee4afc 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -9190,12 +9190,15 @@ static int nft_trans_gc_space(struct nft_trans_gc *trans)
struct nft_trans_gc *nft_trans_gc_queue_async(struct nft_trans_gc *gc,
unsigned int gc_seq, gfp_t gfp)
{
+ struct nft_set *set;
+
if (nft_trans_gc_space(gc))
return gc;
+ set = gc->set;
nft_trans_gc_queue_work(gc);
- return nft_trans_gc_alloc(gc->set, gc_seq, gfp);
+ return nft_trans_gc_alloc(set, gc_seq, gfp);
}
void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
@@ -9210,15 +9213,18 @@ void nft_trans_gc_queue_async_done(struct nft_trans_gc *trans)
struct nft_trans_gc *nft_trans_gc_queue_sync(struct nft_trans_gc *gc, gfp_t gfp)
{
+ struct nft_set *set;
+
if (WARN_ON_ONCE(!lockdep_commit_lock_is_held(gc->net)))
return NULL;
if (nft_trans_gc_space(gc))
return gc;
+ set = gc->set;
call_rcu(&gc->rcu, nft_trans_gc_trans_free);
- return nft_trans_gc_alloc(gc->set, 0, gfp);
+ return nft_trans_gc_alloc(set, 0, gfp);
}
void nft_trans_gc_queue_sync_done(struct nft_trans_gc *trans)
