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GET /api/patches/2222989/?format=api
{ "id": 2222989, "url": "http://patchwork.ozlabs.org/api/patches/2222989/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260414074556.2512750-1-hxzene@gmail.com/", "project": { "id": 26, "url": "http://patchwork.ozlabs.org/api/projects/26/?format=api", "name": "Netfilter Development", "link_name": "netfilter-devel", "list_id": "netfilter-devel.vger.kernel.org", "list_email": "netfilter-devel@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260414074556.2512750-1-hxzene@gmail.com>", "list_archive_url": null, "date": "2026-04-14T07:45:56", "name": "netfilter: nfnetlink_osf: fix null-ptr-deref in nf_osf_ttl", "commit_ref": null, "pull_url": null, "state": "changes-requested", "archived": false, "hash": "8db65fddaa78fda15f7792e50955b3d7d8931cf6", "submitter": { "id": 93139, "url": "http://patchwork.ozlabs.org/api/people/93139/?format=api", "name": "Kito Xu (veritas501)", "email": "hxzene@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260414074556.2512750-1-hxzene@gmail.com/mbox/", "series": [ { "id": 499793, "url": "http://patchwork.ozlabs.org/api/series/499793/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=499793", "date": "2026-04-14T07:45:56", "name": "netfilter: nfnetlink_osf: fix null-ptr-deref in nf_osf_ttl", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499793/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222989/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222989/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <netfilter-devel+bounces-11860-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "netfilter-devel@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=cztyEdwS;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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Miller\" <davem@davemloft.net>,\n\tEric Dumazet <edumazet@google.com>,\n\tJakub Kicinski <kuba@kernel.org>,\n\tPaolo Abeni <pabeni@redhat.com>,\n\tSimon Horman <horms@kernel.org>,\n\tFernando Fernandez Mancera <ffmancera@riseup.net>,\n\tnetfilter-devel@vger.kernel.org,\n\tcoreteam@netfilter.org,\n\tnetdev@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org", "Subject": "[PATCH] netfilter: nfnetlink_osf: fix null-ptr-deref in nf_osf_ttl", "Date": "Tue, 14 Apr 2026 15:45:56 +0800", "Message-ID": "<20260414074556.2512750-1-hxzene@gmail.com>", "X-Mailer": "git-send-email 2.43.0", "Precedence": "bulk", "X-Mailing-List": "netfilter-devel@vger.kernel.org", "List-Id": "<netfilter-devel.vger.kernel.org>", "List-Subscribe": "<mailto:netfilter-devel+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:netfilter-devel+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit" }, "content": "nf_osf_ttl() calls __in_dev_get_rcu(skb->dev) and passes the result\nto in_dev_for_each_ifa_rcu() without checking for NULL. When the\nreceiving device has no IPv4 configuration (ip_ptr is NULL),\n__in_dev_get_rcu() returns NULL and in_dev_for_each_ifa_rcu()\ndereferences it unconditionally, causing a kernel crash.\n\nThis can happen when a packet arrives on a device that has had its\nIPv4 configuration removed (e.g., MTU set below IPV4_MIN_MTU causing\ninetdev_destroy) or on a device that was never assigned an IPv4\naddress, while an xt_osf or nft_osf rule with TTL_LESS mode is\nactive and the packet TTL exceeds the fingerprint TTL.\n\nAdd a NULL check for in_dev before the iteration. When in_dev is\nNULL, return 0 (no match) since source-address locality cannot be\ndetermined without IPv4 addresses on the device.\n\nKASAN: null-ptr-deref in range\n [0x0000000000000010-0x0000000000000017]\nRIP: 0010:nf_osf_match_one+0x204/0xa70\nCall Trace:\n <IRQ>\n nf_osf_match+0x2f8/0x780\n xt_osf_match_packet+0x11c/0x1f0\n ipt_do_table+0x7fe/0x12b0\n nf_hook_slow+0xac/0x1e0\n ip_rcv+0x123/0x370\n __netif_receive_skb_one_core+0x166/0x1b0\n process_backlog+0x197/0x590\n __napi_poll+0xa1/0x540\n net_rx_action+0x401/0xd80\n handle_softirqs+0x19f/0x610\n </IRQ>\n\nFixes: a218dc82f0b5 (\"netfilter: nft_osf: Add ttl option support\")\nSigned-off-by: Kito Xu (veritas501) <hxzene@gmail.com>\n---\n net/netfilter/nfnetlink_osf.c | 3 +++\n 1 file changed, 3 insertions(+)", "diff": "diff --git a/net/netfilter/nfnetlink_osf.c b/net/netfilter/nfnetlink_osf.c\nindex d64ce21c7b55..85dbd47dbbd4 100644\n--- a/net/netfilter/nfnetlink_osf.c\n+++ b/net/netfilter/nfnetlink_osf.c\n@@ -43,6 +43,9 @@ static inline int nf_osf_ttl(const struct sk_buff *skb,\n \telse if (ip->ttl <= f_ttl)\n \t\treturn 1;\n \n+\tif (!in_dev)\n+\t\treturn 0;\n+\n \tin_dev_for_each_ifa_rcu(ifa, in_dev) {\n \t\tif (inet_ifa_match(ip->saddr, ifa)) {\n \t\t\tret = (ip->ttl == f_ttl);\n", "prefixes": [] }