mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-30 06:10:56 +00:00
Code Issues Releases Wiki Activity

netfilter: nf_tables: skip dead set elements in netlink dump

Browse source 
[ Upstream commit 6b1ca88e4b ]

Delete from packet path relies on the garbage collector to purge
elements with NFT_SET_ELEM_DEAD_BIT on.

Skip these dead elements from nf_tables_dump_setelem() path, I very
rarely see tests/shell/testcases/maps/typeof_maps_add_delete reports
[DUMP FAILED] showing a mismatch in the expected output with an element
that should not be there.

If the netlink dump happens before GC worker run, it might show dead
elements in the ruleset listing.

nft_rhash_get() already skips dead elements in nft_rhash_cmp(),
therefore, it already does not show the element when getting a single
element via netlink control plane.

Fixes: 5f68718b34 ("netfilter: nf_tables: GC transaction API to avoid race with control plane")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso 2024-01-15 00:14:38 +01:00 committed by Greg Kroah-Hartman
parent 77be8c495a
commit d6420b66ad
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
net/netfilter/nf_tables_api.c
View file

@ -5348,7 +5348,7 @@ static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
const struct nft_set_ext *ext = nft_set_elem_ext(set, elem->priv);
struct nft_set_dump_args *args;
if (nft_set_elem_expired(ext))
if (nft_set_elem_expired(ext) || nft_set_elem_is_dead(ext))
return 0;
args = container_of(iter, struct nft_set_dump_args, iter);