syzbot has found a reproducer for the following issue on: HEAD commit: 7059c2c0 Merge branch 'for-linus' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11a1199b500000 kernel config: https://syzkaller.appspot.com/x/.config?x=e49433cfed49b7d9 dashboard link: https://syzkaller.appspot.com/bug?extid=7f064ba1704c2466e36d compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=146ff2ef500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=105d68df500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7f064ba1704c2466e36d@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 1 PID: 9804 at net/wireless/ibss.c:36 __cfg80211_ibss_joined+0x487/0x520 net/wireless/ibss.c:36 Modules linked in: CPU: 1 PID: 9804 Comm: kworker/u4:6 Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: cfg80211 cfg80211_event_work RIP: 0010:__cfg80211_ibss_joined+0x487/0x520 net/wireless/ibss.c:36 Code: 0f 0b e9 0c fe ff ff e8 b7 55 7a f9 e9 41 fc ff ff e8 8d 55 7a f9 e9 7d fc ff ff e8 a3 55 7a f9 e9 0d ff ff ff e8 29 d7 38 f9 <0f> 0b e9 7e fc ff ff e8 1d d7 38 f9 0f 0b e8 96 55 7a f9 e9 e4 fb RSP: 0018:ffffc9000a85fbd8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888014edcc10 RCX: ffffffff8155a937 RDX: ffff88802295b480 RSI: ffffffff88372d57 RDI: 0000000000000000 RBP: ffff888014edc000 R08: 0000000000000001 R09: ffffffff8ebaf6bf R10: fffffbfff1d75ed7 R11: 0000000000000000 R12: 1ffff9200150bf7d R13: ffff88803471e818 R14: 0000000000000000 R15: 0000000000000006 FS: 0000000000000000(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020e0a000 CR3: 0000000025d73000 CR4: 0000000000350ee0 Call Trace: cfg80211_process_wdev_events+0x3de/0x5b0 net/wireless/util.c:942 cfg80211_process_rdev_events+0x6e/0x100 net/wireless/util.c:968 cfg80211_event_work+0x1a/0x20 net/wireless/core.c:322 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
