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AKwUvBw7zZm8r+jmD3AbTQ92k1xFekc1NNLNggQCvgq6CG95uiCKnTs9mOp8me1MlV2n5BdRZqt7wOEcwtkHUGnOew==@vger.kernel.org X-Gm-Message-State: AFuF++kqaq9MfD0ew4qtSwLBIRE5dukgU1zKXfQheg7Ni0K/6ZmNnsZD CVTzt6vYvixSUYVHP5lxvXbwM76/F644FPZS86wznvj9/U2ux0C/e5PPM41KcD9ZDUX4+uyhauc OE/k0usrBHiIGtfix/YDt6BN9EPwi6dfdkA7Pl8k3Eb/hwcaw1AghE5/rqUQ= Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4b10:b0:6c3:398:8d29 with SMTP id 006d021491bc7-6ca9be501b5mr7224156eaf.34.1789901392905; Sun, 20 Sep 2026 03:49:52 -0700 (PDT) Date: Sun, 20 Sep 2026 03:49:52 -0700 In-Reply-To: <20260917221205.3214125-1-roryl@candelatech.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aafba50.514bccd6.255447.0006.GAE@google.com> Subject: [syzbot ci] Re: net: cfg80211: Validate monitor channel set against radio usage From: syzbot ci To: dylan.eskew@candelatech.com, johannes@sipsolutions.net, linux-wireless@vger.kernel.org, roryl@candelatech.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] net: cfg80211: Validate monitor channel set against radio usage https://lore.kernel.org/all/20260917221205.3214125-1-roryl@candelatech.com * [PATCH wireless-next] net: cfg80211: Validate monitor channel set against radio usage and found the following issue: UBSAN: shift-out-of-bounds in cfg80211_set_monitor_channel Full report is available here: https://ci.syzbot.org/series/096ed229-0401-4402-9865-92c5b6d81b57 *** UBSAN: shift-out-of-bounds in cfg80211_set_monitor_channel tree: wireless-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/wireless/wireless-next.git base: 3b35f726c20d138fafa154182ee926a419306269 arch: amd64 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/7147a923-683e-41dc-b623-05cfe4ac2a30/config syz repro: https://ci.syzbot.org/findings/525583ec-5ed7-4adc-aeab-6eb3b293f9ee/syz_repro ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in net/wireless/chan.c:1831:49 shift exponent -22 is negative CPU: 1 UID: 0 PID: 5855 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233 __ubsan_handle_shift_out_of_bounds+0x36d/0x400 lib/ubsan.c:494 cfg80211_can_set_monitor_channel net/wireless/chan.c:1831 [inline] cfg80211_set_monitor_channel+0x38a/0x8d0 net/wireless/chan.c:1844 __nl80211_set_channel+0x340/0x990 net/wireless/nl80211.c:4203 nl80211_set_wiphy+0x127c/0x3050 net/wireless/nl80211.c:-1 genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800 __sock_sendmsg net/socket.c:815 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2713 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767 __sys_sendmsg net/socket.c:2799 [inline] __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7e3a59e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7e3b3d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7e3a825fa0 RCX: 00007f7e3a59e159 RDX: 0000000004040000 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007f7e3a63506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7e3a826038 R14: 00007f7e3a825fa0 R15: 00007ffd12ef16a8 ---[ end trace ]--- *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported.