syzbot


general protection fault in ieee80211_assign_vif_chanctx

Status: upstream: reported C repro on 2020/10/05 21:07
Reported-by: syzbot+ae673a196d4eddbe582b@syzkaller.appspotmail.com
First crash: 726d, last: 720d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in ieee80211_assign_vif_chanctx C inconclusive 4 345d 603d 22/24 fixed on 2022/03/08 16:11

Sample crash report:
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 332 Comm: syz-executor766 Not tainted 5.4.70-syzkaller-00063-gd0e6eb879517 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ieee80211_chanctx_num_assigned net/mac80211/chan.c:21 [inline]
RIP: 0010:ieee80211_assign_vif_chanctx+0x287/0x590 net/mac80211/chan.c:677
Code: e7 e8 4d 33 b8 fd 49 8b 1c 24 49 39 dc 0f 84 7e 01 00 00 e8 1b 79 8a fd bd 01 00 00 00 66 0f 1f 44 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 1a 33 b8 fd 48 8b 1b 49 39 dc 74
RSP: 0018:ffff8881cdd1f1f0 EFLAGS: 00010a02
RAX: 1bd5a00000000020 RBX: dead000000000100 RCX: ffff8881ce046c80
RDX: 0000000000000000 RSI: 0000000000000020 RDI: ffff8881d6ca0da0
RBP: 0000000000000002 R08: ffffffff83b75d0b R09: ffffed1039ba3e4d
R10: ffffed1039ba3e4d R11: 0000000000000000 R12: ffff8881cf3ae720
R13: ffff8881cf3ae700 R14: dffffc0000000000 R15: ffff8881d6ca0940
FS:  00000000010f8940(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006d3090 CR3: 00000001cf3e6004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __ieee80211_vif_release_channel+0x196/0x770 net/mac80211/chan.c:1544
 ieee80211_vif_release_channel+0xc4/0x100 net/mac80211/chan.c:1758
 ieee80211_ibss_disconnect+0x8bb/0xa50 net/mac80211/ibss.c:742
 ieee80211_ibss_leave+0x26/0xe0 net/mac80211/ibss.c:1865
 rdev_leave_ibss+0x194/0x2f0 net/wireless/rdev-ops.h:532
 __cfg80211_leave_ibss net/wireless/ibss.c:212 [inline]
 cfg80211_leave_ibss+0x97/0x130 net/wireless/ibss.c:230
 cfg80211_change_iface+0x2eb/0x970 net/wireless/util.c:965
 nl80211_set_interface+0x4f8/0x880 net/wireless/nl80211.c:3566
 genl_family_rcv_msg net/netlink/genetlink.c:629 [inline]
 genl_rcv_msg+0xe76/0x1330 net/netlink/genetlink.c:654
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2478
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:665
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x87c/0xa20 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x9a7/0xd40 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg net/socket.c:658 [inline]
 ____sys_sendmsg+0x56f/0x860 net/socket.c:2298
 ___sys_sendmsg net/socket.c:2352 [inline]
 __sys_sendmsg+0x26a/0x350 net/socket.c:2398
 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4429b9
Code: e8 bc fd 02 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd2098e2d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004429b9
RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000004
RBP: 0000000000005008 R08: 00000000004035b0 R09: 00000000004035b0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403520
R13: 00000000004035b0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 945ad0191387b29a ]---
RDX: 0000000000000000 RSI: 0000000000000020 RDI: ffff8881d6ca0da0
R13: ffff8881cf3ae700 R14: dffffc0000000000 R15: ffff8881d6ca0940
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006d3090 CR3: 00000001cf3e6004 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-android-5-4-kasan 2020/10/12 05:57 android12-5.4 d0e6eb879517 4a77ae0b .config log report syz C
ci2-android-5-4-kasan 2020/10/06 10:38 android12-5.4 9d0d630081ae 1880b4a9 .config log report syz C
ci2-android-5-4-kasan 2020/10/05 21:06 android12-5.4 9d0d630081ae 1880b4a9 .config log report syz C
* Struck through repros no longer work on HEAD.