bisecting fixing commit since 31acccdc877486a649a86d37725a15175fcd5ed6 building syzkaller on 09323409cdbe048449a5a6819c076492c166f18a testing commit 31acccdc877486a649a86d37725a15175fcd5ed6 with gcc (GCC) 8.4.1 20210217 kernel signature: 7d6e44a9cf40e8a96749535967d56a55f4ab6f624b3acbb55c4b3729ef303815 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: use-after-free 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 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: use-after-free 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 125222814e7b8f84df767d6ab622aff2a6d2f234 testing commit 125222814e7b8f84df767d6ab622aff2a6d2f234 with gcc (GCC) 8.4.1 20210217 kernel signature: 109e380301623953b109a140378dea126b62261ae5a1f19b8b8dc810ab620aba 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: use-after-free 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: 22m16.01339271s (build: 15m13.986891648s, test: 6m29.016238564s) the crash still happens on HEAD commit msg: Linux 4.19.182 crash: KASAN: slab-out-of-bounds Read in ieee80211_key_free wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 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 ffff8881ed1b2468 by task syz-executor.0/9282 CPU: 1 PID: 9282 Comm: syz-executor.0 Not tainted 4.19.182-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: 0033:0x465889 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:00007f7c602f7188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 RBP: 00000000004af68d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007ffebb66289f R14: 00007f7c602f7300 R15: 0000000000022000 Allocated by task 7: 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 kmem_cache_alloc_trace+0x152/0x3a0 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] batadv_mcast_mla_softif_get net/batman-adv/multicast.c:177 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:618 [inline] batadv_mcast_mla_update+0xd3d/0x2060 net/batman-adv/multicast.c:654 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2152 worker_thread+0x85/0xb60 kernel/workqueue.c:2295 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Freed by task 7: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x13c/0x220 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3503 [inline] kfree+0xcf/0x220 mm/slab.c:3822 batadv_mcast_mla_list_free net/batman-adv/multicast.c:315 [inline] __batadv_mcast_mla_update net/batman-adv/multicast.c:631 [inline] batadv_mcast_mla_update+0x949/0x2060 net/batman-adv/multicast.c:654 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2152 worker_thread+0x85/0xb60 kernel/workqueue.c:2295 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff8881ed1b2440 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes to the right of 32-byte region [ffff8881ed1b2440, ffff8881ed1b2460) The buggy address belongs to the page: page:ffffea0007b46c80 count:1 mapcount:0 mapping:ffff8881f60001c0 index:0xffff8881ed1b2fc1 flags: 0x17ff00000000100(slab) raw: 017ff00000000100 ffffea0007b28088 ffffea0007995f08 ffff8881f60001c0 raw: ffff8881ed1b2fc1 ffff8881ed1b2000 000000010000003f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881ed1b2300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8881ed1b2380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8881ed1b2400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8881ed1b2480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8881ed1b2500: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ================================================================== BUG: unable to handle kernel paging request at ffffffff819c5ab0 PGD 986e067 P4D 986e067 PUD 986f063 PMD 18001e1 Oops: 0003 [#1] PREEMPT SMP KASAN CPU: 1 PID: 9282 Comm: syz-executor.0 Tainted: G B 4.19.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__write_once_size include/linux/compiler.h:234 [inline] RIP: 0010:ieee80211_key_replace+0x25b/0x9e0 net/mac80211/key.c:347 Code: c9 49 63 c7 0f 85 c6 01 00 00 4d 8d 74 c5 58 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 05 06 00 00 <4d> 89 26 4c 89 ef e8 7a 64 fd ff 48 85 db 0f 84 c5 00 00 00 4c 8d RSP: 0018:ffff8881cf347498 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8881ed1b2200 RCX: ffffffff87352035 RDX: 1ffffffff0338b56 RSI: 0000000000000001 RDI: ffff8881ed1b2467 RBP: ffff8881cf3474e0 R08: 00000000000000b3 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff89a1b063 R12: 0000000000000000 R13: ffffffff819c5cc0 R14: ffffffff819c5ab0 R15: 00000000ffffffb3 FS: 00007f7c602f7700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff819c5ab0 CR3: 00000001f2656006 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ieee80211_key_free+0xa3/0xe0 net/mac80211/key.c:721 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: 0033:0x465889 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:00007f7c602f7188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000055bf00 RCX: 0000000000465889 RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 RBP: 00000000004af68d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000055bf00 R13: 00007ffebb66289f R14: 00007f7c602f7300 R15: 0000000000022000 Modules linked in: CR2: ffffffff819c5ab0 ---[ end trace a95ae164f00e4edf ]--- RIP: 0010:__write_once_size include/linux/compiler.h:234 [inline] RIP: 0010:ieee80211_key_replace+0x25b/0x9e0 net/mac80211/key.c:347 Code: c9 49 63 c7 0f 85 c6 01 00 00 4d 8d 74 c5 58 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 80 3c 02 00 0f 85 05 06 00 00 <4d> 89 26 4c 89 ef e8 7a 64 fd ff 48 85 db 0f 84 c5 00 00 00 4c 8d RSP: 0018:ffff8881cf347498 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff8881ed1b2200 RCX: ffffffff87352035 RDX: 1ffffffff0338b56 RSI: 0000000000000001 RDI: ffff8881ed1b2467 RBP: ffff8881cf3474e0 R08: 00000000000000b3 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff89a1b063 R12: 0000000000000000 R13: ffffffff819c5cc0 R14: ffffffff819c5ab0 R15: 00000000ffffffb3 FS: 00007f7c602f7700(0000) GS:ffff8881f6500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff819c5ab0 CR3: 00000001f2656006 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400