bisecting fixing commit since 0f1b4cb77d7f5a442b03f8ad597768b422e8ec58 building syzkaller on c59079a693ad1d89c782f7db14b9f1c5629e2abc testing commit 0f1b4cb77d7f5a442b03f8ad597768b422e8ec58 with gcc (GCC) 8.4.1 20210217 kernel signature: efaa378c50e7b864be0b9321a2e9be9e52b2a0761cc717f6f50a9368194fb580 run #0: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #1: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #2: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #3: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #4: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #5: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #6: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #7: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #8: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #9: crashed: KASAN: use-after-free Read in ieee80211_key_free run #10: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #11: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #12: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #13: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #14: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #15: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #16: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #17: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #18: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #19: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free testing current HEAD 3c8c23092588a23bf1856a64f58c37f477a413be testing commit 3c8c23092588a23bf1856a64f58c37f477a413be with gcc (GCC) 8.4.1 20210217 kernel signature: 7fc72ceca52b5dfceffb167c7232deaf425e4fc7eb2c4cd39e56b32782fefe86 run #0: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #1: crashed: KASAN: use-after-free Read in ieee80211_key_free run #2: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #3: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #4: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #5: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #6: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #7: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #8: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free run #9: crashed: KASAN: slab-out-of-bounds Read in ieee80211_key_free revisions tested: 2, total time: 29m54.79717022s (build: 22m28.773679703s, test: 6m50.52965826s) the crash still happens on HEAD commit msg: Linux 4.19.190 crash: KASAN: slab-out-of-bounds Read in ieee80211_key_free IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready ================================================================== BUG: KASAN: slab-out-of-bounds in ieee80211_key_free+0xcf/0xe0 net/mac80211/key.c:722 Read of size 2 at addr ffff88809b7a7da8 by task syz-executor.1/9805 CPU: 0 PID: 9805 Comm: syz-executor.1 Not tainted 4.19.190-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x17c/0x226 lib/dump_stack.c:118 print_address_description.cold.6+0x9/0x211 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:396 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431 ieee80211_key_free+0xcf/0xe0 net/mac80211/key.c:722 ieee80211_del_key+0x124/0x300 net/mac80211/cfg.c:498 rdev_del_key net/wireless/rdev-ops.h:106 [inline] nl80211_del_key+0x362/0xa20 net/wireless/nl80211.c:3656 genl_family_rcv_msg+0x599/0x1000 net/netlink/genetlink.c:602 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:627 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466459 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdaf90b8188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 00000000200006c0 RDI: 0000000000000003 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffd66d8756f R14: 00007fdaf90b8300 R15: 0000000000022000 Allocated by task 8459: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:553 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:538 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc_track_caller+0x159/0x3d0 mm/slab.c:3742 kstrdup+0x2c/0x60 mm/util.c:56 kstrdup_const+0x1f/0x30 mm/util.c:77 __kernfs_new_node+0xb0/0x6f0 fs/kernfs/dir.c:629 kernfs_new_node+0x62/0x110 fs/kernfs/dir.c:693 kernfs_create_dir_ns+0x27/0x120 fs/kernfs/dir.c:1019 sysfs_create_dir_ns+0x121/0x270 fs/sysfs/dir.c:58 create_dir lib/kobject.c:88 [inline] kobject_add_internal+0x257/0x8d0 lib/kobject.c:247 kobject_add_varg lib/kobject.c:382 [inline] kobject_add+0x10f/0x170 lib/kobject.c:426 device_add+0x33e/0x16b0 drivers/base/core.c:2121 wiphy_register+0x1624/0x2930 net/wireless/core.c:832 ieee80211_register_hw+0x1179/0x3fb0 net/mac80211/main.c:1103 mac80211_hwsim_new_radio+0x1a57/0x3750 drivers/net/wireless/mac80211_hwsim.c:2896 hwsim_new_radio_nl+0x517/0x8d0 drivers/net/wireless/mac80211_hwsim.c:3374 genl_family_rcv_msg+0x599/0x1000 net/netlink/genetlink.c:602 genl_rcv_msg+0xa7/0x140 net/netlink/genetlink.c:627 netlink_rcv_skb+0x13e/0x3d0 net/netlink/af_netlink.c:2455 genl_rcv+0x23/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x660 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x667/0xc60 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xac/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff88809b7a7d80 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes to the right of 32-byte region [ffff88809b7a7d80, ffff88809b7a7da0) The buggy address belongs to the page: page:ffffea00026de9c0 count:1 mapcount:0 mapping:ffff88813bff61c0 index:0xffff88809b7a7fc1 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea00026ddf48 ffffea00026cf608 ffff88813bff61c0 raw: ffff88809b7a7fc1 ffff88809b7a7000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809b7a7c80: 00 01 fc fc fc fc fc fc 00 01 fc fc fc fc fc fc ffff88809b7a7d00: 00 01 fc fc fc fc fc fc 05 fc fc fc fc fc fc fc >ffff88809b7a7d80: 05 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff88809b7a7e00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff88809b7a7e80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================