memory leak in vhost_net

memory leak in vhost_net_ioctl
Status: upstream: reported C repro on 2019/06/05 23:42
Reported-by: syzbot+0789f0c7e45efd7bb643@syzkaller.appspotmail.com
First crash: 640d, last: 614d

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2019/07/15 03:34	16m	jasowang@redhat.com	patch	net	OK
2019/07/12 13:00	16m	jasowang@redhat.com	patch	net	OK
2019/07/10 04:37	16m	jasowang@redhat.com	patch	upstream	report log
2019/06/14 02:45	17m	hdanton@sina.com	patch	upstream	report log
2019/06/13 14:55	8m	dvyukov@google.com	patch	upstream	report log

Sample crash report:

executing program
BUG: memory leak
unreferenced object 0xffff888108cb5040 (size 64):
  comm "syz-executor532", pid 7123, jiffies 4294942481 (age 7.820s)
  hex dump (first 32 bytes):
    01 00 00 00 20 69 6f 63 00 00 00 00 64 65 76 2f  .... ioc....dev/
    50 50 cb 08 81 88 ff ff 50 50 cb 08 81 88 ff ff  PP......PP......
  backtrace:
    [<00000000e620582a>] kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
    [<00000000e620582a>] slab_post_alloc_hook mm/slab.h:439 [inline]
    [<00000000e620582a>] slab_alloc mm/slab.c:3326 [inline]
    [<00000000e620582a>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
    [<00000000a39cd283>] kmalloc include/linux/slab.h:547 [inline]
    [<00000000a39cd283>] vhost_net_ubuf_alloc drivers/vhost/net.c:240 [inline]
    [<00000000a39cd283>] vhost_net_set_backend drivers/vhost/net.c:1533 [inline]
    [<00000000a39cd283>] vhost_net_ioctl+0xb43/0xc10 drivers/vhost/net.c:1715
    [<000000006769099f>] vfs_ioctl fs/ioctl.c:46 [inline]
    [<000000006769099f>] file_ioctl fs/ioctl.c:509 [inline]
    [<000000006769099f>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
    [<000000009a930129>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
    [<000000009fe57c78>] __do_sys_ioctl fs/ioctl.c:720 [inline]
    [<000000009fe57c78>] __se_sys_ioctl fs/ioctl.c:718 [inline]
    [<000000009fe57c78>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
    [<0000000092220792>] do_syscall_64+0x76/0x1a0 arch/x86/entry/common.c:301
    [<000000009fa3adfa>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Crashes (11):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-gce-leak	2019/07/01 11:41	upstream	6fbc7275	699d6448	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/30 10:23	upstream	72825454	7509bf36	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/29 09:24	upstream	556e2f60	7509bf36	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/28 12:25	upstream	c84afab0	7509bf36	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/26 20:07	upstream	249155c2	7509bf36	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/26 16:32	upstream	249155c2	4d342240	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/24 04:43	upstream	241e3900	472f0082	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/19 04:37	upstream	29f785ff	e3f76baa	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/13 11:51	upstream	b076173a	3f4e812b	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/09 10:27	upstream	8d72e5bd	0159583c	.config	log	report	syz	C
ci-upstream-gce-leak	2019/06/05 21:09	upstream	788a0249	bfb4a51e	.config	log	report	syz	C