{"id":2229267,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2229267/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260427234014.86256-1-ja@ssi.bg/","project":{"id":26,"url":"http://patchwork.ozlabs.org/api/1.1/projects/26/?format=json","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},"msgid":"<20260427234014.86256-1-ja@ssi.bg>","date":"2026-04-27T23:40:14","name":"[net] ipvs: fix shift-out-of-bounds in ip_vs_rht_desired_size","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"4c8889fe6f52fdc0fbe33cac98deb4f9022111ce","submitter":{"id":2825,"url":"http://patchwork.ozlabs.org/api/1.1/people/2825/?format=json","name":"Julian Anastasov","email":"ja@ssi.bg"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260427234014.86256-1-ja@ssi.bg/mbox/","series":[{"id":501744,"url":"http://patchwork.ozlabs.org/api/1.1/series/501744/?format=json","web_url":"http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=501744","date":"2026-04-27T23:40:14","name":"[net] ipvs: fix shift-out-of-bounds in ip_vs_rht_desired_size","version":1,"mbox":"http://patchwork.ozlabs.org/series/501744/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2229267/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2229267/checks/","tags":{},"headers":{"Return-Path":"\n ","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 (4096-bit key;\n unprotected) header.d=ssi.bg header.i=@ssi.bg header.a=rsa-sha256\n header.s=ssi header.b=bE+pno7q;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c15:e001:75::12fc:5321; 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s=ssi; bh=+N8l8xhO\n\t6EweGkIZO6SUeyy8/92nakMTqZK+u/GGXGQ=; b=bE+pno7qsEoY9xS+GdCoyxYr\n\tc44u8l1CTEUqU0wbr1dNuIVphKO2353TJcLlFWmHca4bUEM0XAr0ASeA+63Wb2bz\n\tOF0kZP4u2DUGpj4Cb+O8u41QndsyDv0J/0pOl1gqs0hRcIqyNP2BsMoL2Yn81xI6\n\tQjzWkS0fy+FhRwpQiTe0Bh+O0WDt4IfdAU9x4AMOGpm8bk83Xo3XWlY0ofdYm39/\n\t8q2rPJcSVqGk5qAmy8si3oifw0805ynUov3nFRpgaVaS3qeinuKiM2TIlHmWj3nO\n\t771+r1VrP1L4RizGi0onE5A4305MHBSRO1sUhbo83o47vrlOvxJB8W8MGyrD1Gnv\n\tTiDt8KVKywhVKrWN4wUvNSiyKPSunmw8N8nEuKnHwrqW/MEtBKdsw3ve3+U/CbD2\n\tbfWe6Ub95Ta5biJBVM6S8wnTRFJ7WcA+BCYBQOjOODYj74USIRwcuH7G0aoK7Fnz\n\tNw2HMnSb3ymcOdDITk99Pv8RTQeuZKYSTpcYt8dJP1GyqQCg37Fh7nts/nNGC1S4\n\tH0RfedQcppXrdJXbproe3JYPUTdDe11da60sT6OARDkjT6MQQv/m7HrEPXNj0z+z\n\tgUmnEidXm2noEdjxWIX3NBVJj7zEfsHmv5emZ2hc9xy2aJ042gseH4XKho6Oe2xn\n\tQYFiMfQBk18qXYeI2Zo=","From":"Julian Anastasov ","To":"Simon Horman ","Cc":"Pablo Neira Ayuso , Florian Westphal ,\n lvs-devel@vger.kernel.org, netfilter-devel@vger.kernel.org,\n netdev@vger.kernel.org","Subject":"[PATCH net] ipvs: fix shift-out-of-bounds in ip_vs_rht_desired_size","Date":"Tue, 28 Apr 2026 02:40:14 +0300","Message-ID":"<20260427234014.86256-1-ja@ssi.bg>","X-Mailer":"git-send-email 2.53.0","Precedence":"bulk","X-Mailing-List":"netfilter-devel@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit"},"content":"Calling roundup_pow_of_two() with 0 has undefined result:\n\nUBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:13\nshift exponent 64 is too large for 64-bit type 'unsigned long'\nCPU: 1 UID: 0 PID: 77 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026\nWorkqueue: events_unbound conn_resize_work_handler\nCall Trace:\n \n dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n ubsan_epilogue+0xa/0x30 lib/ubsan.c:233\n __ubsan_handle_shift_out_of_bounds+0x385/0x410 lib/ubsan.c:494\n __roundup_pow_of_two include/linux/log2.h:57 [inline]\n ip_vs_rht_desired_size+0x2cf/0x410 net/netfilter/ipvs/ip_vs_core.c:240\n ip_vs_conn_desired_size net/netfilter/ipvs/ip_vs_conn.c:765 [inline]\n conn_resize_work_handler+0x1b6/0x14c0 net/netfilter/ipvs/ip_vs_conn.c:822\n process_one_work kernel/workqueue.c:3302 [inline]\n process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3385\n worker_thread+0xa53/0xfc0 kernel/workqueue.c:3466\n kthread+0x388/0x470 kernel/kthread.c:436\n ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n \n\nReported-by: syzbot+217f1db9c791e27fe54a@syzkaller.appspotmail.com\nFixes: b655388111cf (\"ipvs: add resizable hash tables\")\nSigned-off-by: Julian Anastasov \n---\n net/netfilter/ipvs/ip_vs_core.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)","diff":"diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c\nindex f5b7a2047291..ea450944465f 100644\n--- a/net/netfilter/ipvs/ip_vs_core.c\n+++ b/net/netfilter/ipvs/ip_vs_core.c\n@@ -237,7 +237,7 @@ int ip_vs_rht_desired_size(struct netns_ipvs *ipvs, struct ip_vs_rht *t, int n,\n {\n \tif (!t)\n \t\treturn 1 << min_bits;\n-\tn = roundup_pow_of_two(n);\n+\tn = n ? roundup_pow_of_two(n) : 1;\n \tif (lfactor < 0) {\n \t\tint factor = min(-lfactor, max_bits);\n \n","prefixes":["net"]}