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Fri, 17 Apr 2026 16:18:56 +0800 (CST) X-RM-TRANSID: 2f3469e1ecee885-018a3 From: Li hongliang <1468888505@139.com> To: gregkh@linuxfoundation.org, stable@vger.kernel.org, pablo@netfilter.org Cc: patches@lists.linux.dev, linux-kernel@vger.kernel.org, kadlec@netfilter.org, fw@strlen.de, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, giki.shergill@proton.me Subject: [PATCH 6.6.y] nf_tables: nft_dynset: fix possible stateful expression memleak in error path Date: Fri, 17 Apr 2026 16:18:55 +0800 Message-Id: <20260417081855.3253507-1-1468888505@139.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Pablo Neira Ayuso [ Upstream commit 0548a13b5a145b16e4da0628b5936baf35f51b43 ] If cloning the second stateful expression in the element via GFP_ATOMIC fails, then the first stateful expression remains in place without being released. =C2=A0 unreferenced object (percpu) 0x607b97e9cab8 (size 16): =C2=A0 =C2=A0 comm "softirq", pid 0, jiffies 4294931867 =C2=A0 =C2=A0 hex dump (first 16 bytes on cpu 3): =C2=A0 =C2=A0 =C2=A0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =C2=A0 =C2=A0 backtrace (crc 0): =C2=A0 =C2=A0 =C2=A0 pcpu_alloc_noprof+0x453/0xd80 =C2=A0 =C2=A0 =C2=A0 nft_counter_clone+0x9c/0x190 [nf_tables] =C2=A0 =C2=A0 =C2=A0 nft_expr_clone+0x8f/0x1b0 [nf_tables] =C2=A0 =C2=A0 =C2=A0 nft_dynset_new+0x2cb/0x5f0 [nf_tables] =C2=A0 =C2=A0 =C2=A0 nft_rhash_update+0x236/0x11c0 [nf_tables] =C2=A0 =C2=A0 =C2=A0 nft_dynset_eval+0x11f/0x670 [nf_tables] =C2=A0 =C2=A0 =C2=A0 nft_do_chain+0x253/0x1700 [nf_tables] =C2=A0 =C2=A0 =C2=A0 nft_do_chain_ipv4+0x18d/0x270 [nf_tables] =C2=A0 =C2=A0 =C2=A0 nf_hook_slow+0xaa/0x1e0 =C2=A0 =C2=A0 =C2=A0 ip_local_deliver+0x209/0x330 Fixes: 563125a73ac3 ("netfilter: nftables: generalize set extension to supp= ort for several expressions") Reported-by: Gurpreet Shergill Signed-off-by: Pablo Neira Ayuso Signed-off-by: Florian Westphal [ Minor conflict resolved. ] Signed-off-by: Li hongliang <1468888505@139.com> --- include/net/netfilter/nf_tables.h | 2 ++ net/netfilter/nf_tables_api.c | 4 ++-- net/netfilter/nft_dynset.c | 10 +++++++++- 3 files changed, 13 insertions(+), 3 deletions(-) diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_t= ables.h index 000ae2900f8c..ab0567951e31 100644 --- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -861,6 +861,8 @@ void *nft_set_elem_init(const struct nft_set *set, u64 timeout, u64 expiration, gfp_t gfp); int nft_set_elem_expr_clone(const struct nft_ctx *ctx, struct nft_set *set, struct nft_expr *expr_array[]); +void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, + struct nft_set_elem_expr *elem_expr); void nft_set_elem_destroy(const struct nft_set *set, void *elem, bool destroy_expr); void nf_tables_set_elem_destroy(const struct nft_ctx *ctx, diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 0aaddc1131c6..a0914a92e07d 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -6464,8 +6464,8 @@ static void __nft_set_elem_expr_destroy(const struct = nft_ctx *ctx, } } =20 -static void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, - struct nft_set_elem_expr *elem_expr) +void nft_set_elem_expr_destroy(const struct nft_ctx *ctx, + struct nft_set_elem_expr *elem_expr) { struct nft_expr *expr; u32 size; diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c index 9a0aaeed2360..87c6a02675ba 100644 --- a/net/netfilter/nft_dynset.c +++ b/net/netfilter/nft_dynset.c @@ -30,18 +30,26 @@ static int nft_dynset_expr_setup(const struct nft_dynse= t *priv, const struct nft_set_ext *ext) { struct nft_set_elem_expr *elem_expr =3D nft_set_ext_expr(ext); + struct nft_ctx ctx =3D { + .net =3D read_pnet(&priv->set->net), + .family =3D priv->set->table->family, + }; struct nft_expr *expr; int i; =20 for (i =3D 0; i < priv->num_exprs; i++) { expr =3D nft_setelem_expr_at(elem_expr, elem_expr->size); if (nft_expr_clone(expr, priv->expr_array[i], GFP_ATOMIC) < 0) - return -1; + goto err_out; =20 elem_expr->size +=3D priv->expr_array[i]->ops->size; } =20 return 0; +err_out: + nft_set_elem_expr_destroy(&ctx, elem_expr); + + return -1; } =20 static void *nft_dynset_new(struct nft_set *set, const struct nft_expr *ex= pr, --=20 2.34.1