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
Fix commit: ccff81e1d028 bpf: Fix false positive kmemleak report in bpf_ringbuf_area_alloc()
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32 ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386]
First crash: 118d, last: 45d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	memory leak in bpf	C			9	166d	248d	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 (3):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Title
ci-upstream-gce-leak	2021/03/28 01:03	upstream	0f4498cef9f5	a8529b82	.config	log	report	syz	C	memory leak in bpf
ci-upstream-gce-leak	2021/06/08 14:19	upstream	614124bea77e	b718257f	.config	log	report	syz		memory leak in bpf
ci-upstream-gce-leak	2021/05/28 11:24	upstream	97e5bf604b7a	858ea628	.config	log	report	syz		memory leak in bpf