memory leak in bpf (2)

memory leak in bpf (2)
Status: upstream: reported C repro on 2021/04/01 01:08
Reported-by: syzbot+5d895828587f49e7fe9b@syzkaller.appspotmail.com
First crash: 26d, last: 26d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	memory leak in bpf	C			9	73d	156d	0/22	closed as invalid on 2021/03/01 16:21

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2021/04/07 23:09	16m	rkovhaev@gmail.com	patch	upstream	OK

Sample crash report:

Warning: Permanently added '10.128.0.74' (ECDSA) to the list of known hosts.
executing program
executing program
BUG: memory leak
unreferenced object 0xffff8881133295c0 (size 64):
  comm "syz-executor529", pid 8395, jiffies 4294943939 (age 8.130s)
  hex dump (first 32 bytes):
    40 48 3c 04 00 ea ff ff 00 48 3c 04 00 ea ff ff  @H<......H<.....
    c0 e7 3c 04 00 ea ff ff 80 e7 3c 04 00 ea ff ff  ..<.......<.....
  backtrace:
    [<ffffffff8139511c>] kmalloc_node include/linux/slab.h:577 [inline]
    [<ffffffff8139511c>] __bpf_map_area_alloc+0xfc/0x120 kernel/bpf/syscall.c:300
    [<ffffffff813d2414>] bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:90 [inline]
    [<ffffffff813d2414>] bpf_ringbuf_alloc kernel/bpf/ringbuf.c:131 [inline]
    [<ffffffff813d2414>] ringbuf_map_alloc kernel/bpf/ringbuf.c:170 [inline]
    [<ffffffff813d2414>] ringbuf_map_alloc+0x134/0x350 kernel/bpf/ringbuf.c:146
    [<ffffffff8139c8d3>] find_and_alloc_map kernel/bpf/syscall.c:122 [inline]
    [<ffffffff8139c8d3>] map_create kernel/bpf/syscall.c:828 [inline]
    [<ffffffff8139c8d3>] __do_sys_bpf+0x7c3/0x2fe0 kernel/bpf/syscall.c:4375
    [<ffffffff842df20d>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-gce-leak	2021/03/28 01:03	upstream	0f4498ce	a8529b82	.config	log	report	syz	C		memory leak in bpf