linux-kernel - Re: memory leak in vhost_net

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Date:   Thu, 13 Jun 2019 11:26:00 -0700
From:   syzbot <syzbot+0789f0c7e45efd7bb643@...kaller.appspotmail.com>
To:     asias@...hat.com, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, dvyukov@...gle.com,
        hawk@...nel.org, hdanton@...a.com, jakub.kicinski@...ronome.com,
        jasowang@...hat.com, john.fastabend@...il.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mst@...hat.com,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        virtualization@...ts.linux-foundation.org,
        xdp-newbies@...r.kernel.org
Subject: Re: memory leak in vhost_net_ioctl

Hello,

syzbot has tested the proposed patch but the reproducer still triggered  
crash:
memory leak in vhost_net_ioctl

ANGE): hsr_slave_1: link becomes ready
2019/06/13 18:24:57 executed programs: 18
BUG: memory leak
unreferenced object 0xffff88811cbc6ac0 (size 64):
   comm "syz-executor.0", pid 7196, jiffies 4294943804 (age 14.770s)
   hex dump (first 32 bytes):
     01 00 00 00 81 88 ff ff 00 00 00 00 82 88 ff ff  ................
     d0 6a bc 1c 81 88 ff ff d0 6a bc 1c 81 88 ff ff  .j.......j......
   backtrace:
     [<000000006c752978>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
     [<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241  
[inline]
     [<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535  
[inline]
     [<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10  
drivers/vhost/net.c:1717
     [<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
     [<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
     [<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
     [<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
     [<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
     [<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
     [<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
     [<00000000e4407a23>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810b1365c0 (size 64):
   comm "syz-executor.2", pid 7193, jiffies 4294943823 (age 14.580s)
   hex dump (first 32 bytes):
     01 00 00 00 81 88 ff ff 00 00 00 00 81 88 ff ff  ................
     d0 65 13 0b 81 88 ff ff d0 65 13 0b 81 88 ff ff  .e.......e......
   backtrace:
     [<000000006c752978>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
     [<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241  
[inline]
     [<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535  
[inline]
     [<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10  
drivers/vhost/net.c:1717
     [<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
     [<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
     [<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
     [<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
     [<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
     [<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
     [<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
     [<00000000e4407a23>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810be23700 (size 64):
   comm "syz-executor.3", pid 7194, jiffies 4294943823 (age 14.580s)
   hex dump (first 32 bytes):
     01 00 00 00 00 00 00 00 00 00 00 00 00 c9 ff ff  ................
     10 37 e2 0b 81 88 ff ff 10 37 e2 0b 81 88 ff ff  .7.......7......
   backtrace:
     [<000000006c752978>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
     [<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241  
[inline]
     [<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535  
[inline]
     [<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10  
drivers/vhost/net.c:1717
     [<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
     [<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
     [<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
     [<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
     [<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
     [<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
     [<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
     [<00000000e4407a23>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810b136500 (size 64):
   comm "syz-executor.6", pid 7228, jiffies 4294943827 (age 14.540s)
   hex dump (first 32 bytes):
     01 00 00 00 20 69 6f 63 00 00 00 00 64 65 76 2f  .... ioc....dev/
     10 65 13 0b 81 88 ff ff 10 65 13 0b 81 88 ff ff  .e.......e......
   backtrace:
     [<000000006c752978>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
     [<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241  
[inline]
     [<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535  
[inline]
     [<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10  
drivers/vhost/net.c:1717
     [<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
     [<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
     [<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
     [<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
     [<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
     [<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
     [<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
     [<00000000e4407a23>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810b9cfec0 (size 64):
   comm "syz-executor.7", pid 7236, jiffies 4294943829 (age 14.520s)
   hex dump (first 32 bytes):
     01 00 00 00 20 69 6f 63 00 00 00 00 64 65 76 2f  .... ioc....dev/
     d0 fe 9c 0b 81 88 ff ff d0 fe 9c 0b 81 88 ff ff  ................
   backtrace:
     [<000000006c752978>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
     [<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241  
[inline]
     [<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535  
[inline]
     [<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10  
drivers/vhost/net.c:1717
     [<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
     [<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
     [<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
     [<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
     [<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
     [<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
     [<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
     [<00000000e4407a23>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810b9cd380 (size 64):
   comm "syz-executor.4", pid 7218, jiffies 4294943834 (age 14.470s)
   hex dump (first 32 bytes):
     01 00 00 00 81 88 ff ff 00 00 00 00 81 88 ff ff  ................
     90 d3 9c 0b 81 88 ff ff 90 d3 9c 0b 81 88 ff ff  ................
   backtrace:
     [<000000006c752978>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:43 [inline]
     [<000000006c752978>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000006c752978>] slab_alloc mm/slab.c:3326 [inline]
     [<000000006c752978>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000b3825d52>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000b3825d52>] vhost_net_ubuf_alloc drivers/vhost/net.c:241  
[inline]
     [<00000000b3825d52>] vhost_net_set_backend drivers/vhost/net.c:1535  
[inline]
     [<00000000b3825d52>] vhost_net_ioctl+0xb43/0xc10  
drivers/vhost/net.c:1717
     [<00000000700f02d7>] vfs_ioctl fs/ioctl.c:46 [inline]
     [<00000000700f02d7>] file_ioctl fs/ioctl.c:509 [inline]
     [<00000000700f02d7>] do_vfs_ioctl+0x62a/0x810 fs/ioctl.c:696
     [<000000009a0ec0a7>] ksys_ioctl+0x86/0xb0 fs/ioctl.c:713
     [<00000000d9416323>] __do_sys_ioctl fs/ioctl.c:720 [inline]
     [<00000000d9416323>] __se_sys_ioctl fs/ioctl.c:718 [inline]
     [<00000000d9416323>] __x64_sys_ioctl+0x1e/0x30 fs/ioctl.c:718
     [<00000000e4407a23>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<000000008715c149>] entry_SYSCALL_64_after_hwframe+0x44/0xa9



Tested on:

commit:         c11fb13a Merge branch 'for-linus' of git://git.kernel.org/..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11c6b666a00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cb38d33cd06d8d48
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11ff0de1a00000