BUG: unable to handle kernel NULL pointer dereference in bpf_prog

BUG: unable to handle kernel NULL pointer dereference in bpf_prog_ADDR
Status: upstream: reported syz repro on 2020/08/02 22:45
Reported-by: syzbot+192a7fbbece55f740074@syzkaller.appspotmail.com
First crash: 263d, last: 129d

Cause bisection: failed (bisect log)

Fix bisection: failed (bisect log)

Sample crash report:

BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD a7b77067 P4D a7b77067 PUD a792e067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8177 Comm: syz-executor.0 Not tainted 5.9.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bpf_prog_cd248b930ddf8412+0x1f/0x150
Code: cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 55 48 89 e5 48 81 ec 00 00 00 00 53 41 55 41 56 41 57 6a 00 31 c0 48 8b 47 28 <48> 8b 40 00 8b 80 00 01 00 00 5b 41 5f 41 5e 41 5d 5b c9 c3 cc cc
RSP: 0018:ffffc9000a9cfb08 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: ffff8880a7874300 RSI: ffffc90000e72038 RDI: ffffc9000a9cfcb0
RBP: ffffc9000a9cfb30 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000e72000
R13: ffffc90000e72000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f76fd214700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a769e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 bpf_prog_run_xdp include/linux/filter.h:734 [inline]
 bpf_test_run+0x221/0xc70 net/bpf/test_run.c:47
 bpf_prog_test_run_xdp+0x2ca/0x510 net/bpf/test_run.c:563
 bpf_prog_test_run kernel/bpf/syscall.c:2996 [inline]
 __do_sys_bpf+0x2426/0x4c20 kernel/bpf/syscall.c:4196
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d4d9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f76fd213c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000001440 RCX: 000000000045d4d9
RDX: 0000000000000010 RSI: 0000000020001300 RDI: 000000000000000a
RBP: 000000000118d020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007ffdfb16828f R14: 00007f76fd2149c0 R15: 000000000118cfec
Modules linked in:
CR2: 0000000000000000
---[ end trace d9a30a9cc7a518ce ]---
RIP: 0010:bpf_prog_cd248b930ddf8412+0x1f/0x150
Code: cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 55 48 89 e5 48 81 ec 00 00 00 00 53 41 55 41 56 41 57 6a 00 31 c0 48 8b 47 28 <48> 8b 40 00 8b 80 00 01 00 00 5b 41 5f 41 5e 41 5d 5b c9 c3 cc cc
RSP: 0018:ffffc9000a9cfb08 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: ffff8880a7874300 RSI: ffffc90000e72038 RDI: ffffc9000a9cfcb0
RBP: ffffc9000a9cfb30 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90000e72000
R13: ffffc90000e72000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007f76fd214700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000a769e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (18):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info
ci-upstream-kasan-gce-selinux-root	2020/08/23 01:33	upstream	c3d8f220	1da71ab0	.config	log	report	syz
ci-upstream-kasan-gce-root	2020/08/23 01:11	upstream	c3d8f220	1da71ab0	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2020/08/23 01:08	upstream	c3d8f220	1da71ab0	.config	log	report	syz
ci-upstream-kasan-gce-root	2020/08/04 03:54	upstream	3208167a	196277c4	.config	log	report	syz
ci-upstream-kasan-gce-selinux-root	2020/08/02 12:14	upstream	ac3a0c84	63a73341	.config	log	report	syz
ci-upstream-kasan-gce-smack-root	2020/08/01 23:27	upstream	7dc6fd0f	d895b3be	.config	log	report	syz
ci-upstream-bpf-kasan-gce	2020/08/23 01:04	bpf	4af7b32f	1da71ab0	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2020/08/23 01:04	net	eeaac363	1da71ab0	.config	log	report	syz
ci-upstream-bpf-kasan-gce	2020/08/01 18:38	bpf	69138b34	d895b3be	.config	log	report	syz
ci-upstream-net-this-kasan-gce	2020/08/01 18:08	net	69138b34	d895b3be	.config	log	report	syz
ci-upstream-net-kasan-gce	2020/08/23 01:44	net-next	1aecbf18	1da71ab0	.config	log	report	syz
ci-upstream-bpf-next-kasan-gce	2020/08/23 01:04	bpf-next	9c0f8cbd	1da71ab0	.config	log	report	syz
ci-upstream-bpf-next-kasan-gce	2020/08/05 11:07	bpf-next	da795540	b7129355	.config	log	report	syz
ci-upstream-net-kasan-gce	2020/08/01 21:42	net-next	8f3f330d	d895b3be	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2020/08/24 02:00	linux-next	494d311a	cef5ae68	.config	log	report	syz
ci-upstream-linux-next-kasan-gce-root	2020/08/06 03:13	linux-next	01830e6c	0487ea6f	.config	log	report	syz
ci-upstream-bpf-kasan-gce	2020/12/13 07:47	bpf	d9838b1d	bca53db9	.config	log	report		info
ci-upstream-net-this-kasan-gce	2020/08/01 17:19	net	69138b34	d895b3be	.config	log	report