Re: [syzbot] KASAN: invalid-free in bdev_free_inode (2)

From: syzbot
Date: Wed Aug 11 2021 - 07:16:30 EST

Next message: Viresh Kumar: "Re: [PATCH v6 1/2] PM / Domains: Add support for 'required-opps' to set default perf state"
Previous message: John Garry: "Re: [PATCH RFC 2/8] iommu/arm-smmu-v3: Add and use static helper function arm_smmu_cmdq_issue_cmd_with_sync()"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

syzbot has found a reproducer for the following issue on:

HEAD commit: d3432bf10f17 net: Support filtering interfaces on no master
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14fd894e300000
kernel config: https://syzkaller.appspot.com/x/.config?x=8075b2614f3db143
dashboard link: https://syzkaller.appspot.com/bug?extid=5fa698422954b6b9307b
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=174ebaf6300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5fa698422954b6b9307b@xxxxxxxxxxxxxxxxxxxxxxxxx

==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3210 [inline]
BUG: KASAN: double-free or invalid-free in kfree+0xe4/0x530 mm/slub.c:4264

CPU: 1 PID: 11043 Comm: syz-executor.1 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:358
____kasan_slab_free mm/kasan/common.c:346 [inline]
__kasan_slab_free+0x120/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1625 [inline]
slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1650
slab_free mm/slub.c:3210 [inline]
kfree+0xe4/0x530 mm/slub.c:4264
bdev_free_inode+0xe0/0x110 fs/block_dev.c:816
i_callback+0x3f/0x70 fs/inode.c:222
rcu_do_batch kernel/rcu/tree.c:2550 [inline]
rcu_core+0x7ab/0x1380 kernel/rcu/tree.c:2785
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
</IRQ>
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197
Code: 01 f0 4d 89 03 e9 63 fd ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 <65> 8b 05 f9 41 8c 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc9000dccf1d8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801c27d4c0 RSI: ffffffff815d5923 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8fceb8a7
R10: ffffffff815d5919 R11: 0000000000000000 R12: ffffffff84c5a900
R13: 0000000000000200 R14: dffffc0000000000 R15: ffffc9000dccf238
console_unlock+0x7c9/0xc40 kernel/printk/printk.c:2653
vprintk_emit+0x1ca/0x560 kernel/printk/printk.c:2174
vprintk+0x8d/0x260 kernel/printk/printk_safe.c:392
printk+0xba/0xed kernel/printk/printk.c:2216
nbd_genl_connect.cold+0x157/0x16f drivers/block/nbd.c:1852
genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731
genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
___sys_sendmsg+0xf3/0x170 net/socket.c:2457
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f69709a7188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000020000540 RDI: 0000000000000006
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffca6ecd5bf R14: 00007f69709a7300 R15: 0000000000022000

Allocated by task 11042:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522
kmalloc_node include/linux/slab.h:609 [inline]
kzalloc_node include/linux/slab.h:732 [inline]
__alloc_disk_node+0x4e/0x380 block/genhd.c:1246
__blk_mq_alloc_disk+0xec/0x190 block/blk-mq.c:3145
nbd_dev_add+0x2a9/0x940 drivers/block/nbd.c:1703
nbd_genl_connect+0x551/0x1820 drivers/block/nbd.c:1842
genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731
genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
___sys_sendmsg+0xf3/0x170 net/socket.c:2457
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 11042:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1625 [inline]
slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1650
slab_free mm/slub.c:3210 [inline]
kfree+0xe4/0x530 mm/slub.c:4264
__alloc_disk_node+0x2e8/0x380 block/genhd.c:1271
__blk_mq_alloc_disk+0xec/0x190 block/blk-mq.c:3145
nbd_dev_add+0x2a9/0x940 drivers/block/nbd.c:1703
nbd_genl_connect+0x551/0x1820 drivers/block/nbd.c:1842
genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731
genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2403
___sys_sendmsg+0xf3/0x170 net/socket.c:2457
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2486
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888016977000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
512-byte region [ffff888016977000, ffff888016977200)
The buggy address belongs to the page:
page:ffffea00005a5d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x16974
head:ffffea00005a5d00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001164f00 0000000500000005 ffff888010841c80
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 824, ts 2603409140, free_ts 0
prep_new_page mm/page_alloc.c:2436 [inline]
get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391
alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
alloc_slab_page mm/slub.c:1688 [inline]
allocate_slab+0x32e/0x4b0 mm/slub.c:1828
new_slab mm/slub.c:1891 [inline]
new_slab_objects mm/slub.c:2637 [inline]
___slab_alloc+0x473/0x7b0 mm/slub.c:2800
__slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2840
slab_alloc_node mm/slub.c:2922 [inline]
slab_alloc mm/slub.c:2964 [inline]
kmem_cache_alloc_trace+0x30f/0x3c0 mm/slub.c:2981
kmalloc include/linux/slab.h:591 [inline]
kzalloc include/linux/slab.h:721 [inline]
alloc_bprm+0x51/0x8f0 fs/exec.c:1501
kernel_execve+0x55/0x460 fs/exec.c:1941
call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page_owner free stack trace missing

Memory state around the buggy address:
ffff888016976f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888016976f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888016977000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888016977080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888016977100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Next message: Viresh Kumar: "Re: [PATCH v6 1/2] PM / Domains: Add support for 'required-opps' to set default perf state"
Previous message: John Garry: "Re: [PATCH RFC 2/8] iommu/arm-smmu-v3: Add and use static helper function arm_smmu_cmdq_issue_cmd_with_sync()"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]