batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 ================================================================== BUG: KASAN: use-after-free in memcpy include/linux/string.h:347 [inline] BUG: KASAN: use-after-free in batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:717 [inline] BUG: KASAN: use-after-free in batadv_iv_ogm_queue_add+0x2dc/0xe00 net/batman-adv/bat_iv_ogm.c:813 Read of size 60 at addr ffff888099624080 by task kworker/u4:8/13226 CPU: 1 PID: 13226 Comm: kworker/u4:8 Not tainted 4.14.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 memcpy+0x20/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:347 [inline] batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:717 [inline] batadv_iv_ogm_queue_add+0x2dc/0xe00 net/batman-adv/bat_iv_ogm.c:813 batadv_iv_ogm_schedule+0xa38/0xdf0 net/batman-adv/bat_iv_ogm.c:982 batadv_iv_send_outstanding_bat_ogm_packet+0x4ad/0x6a0 net/batman-adv/bat_iv_ogm.c:1809 process_one_work+0x813/0x1540 kernel/workqueue.c:2114 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 13226: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15b/0x7c0 mm/slab.c:3729 kmalloc include/linux/slab.h:493 [inline] batadv_tvlv_realloc_packet_buff net/batman-adv/tvlv.c:288 [inline] batadv_tvlv_container_ogm_append+0x12a/0x490 net/batman-adv/tvlv.c:329 batadv_iv_ogm_schedule+0xb78/0xdf0 net/batman-adv/bat_iv_ogm.c:945 batadv_iv_send_outstanding_bat_ogm_packet+0x4ad/0x6a0 net/batman-adv/bat_iv_ogm.c:1809 process_one_work+0x813/0x1540 kernel/workqueue.c:2114 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Freed by task 168: save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcb/0x260 mm/slab.c:3815 batadv_iv_ogm_iface_disable+0x34/0x70 net/batman-adv/bat_iv_ogm.c:393 batadv_hardif_disable_interface.cold+0x61e/0x867 net/batman-adv/hard-interface.c:836 batadv_softif_destroy_netlink+0xa3/0x140 net/batman-adv/soft-interface.c:1134 default_device_exit_batch+0x209/0x380 net/core/dev.c:8734 ops_exit_list.isra.0+0xef/0x140 net/core/net_namespace.c:145 cleanup_net+0x3bb/0x820 net/core/net_namespace.c:484 process_one_work+0x813/0x1540 kernel/workqueue.c:2114 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff888099624080 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff888099624080, ffff8880996240c0) The buggy address belongs to the page: page:ffffea0002658900 count:1 mapcount:0 mapping:ffff888099624000 index:0xffff888099624f00 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff888099624000 ffff888099624f00 000000010000001d raw: ffffea0002481ee0 ffffea00029116e0 ffff88812fe56340 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888099623f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888099624000: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888099624080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888099624100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888099624180: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ================================================================== kauditd_printk_skb: 75 callbacks suppressed audit: type=1804 audit(1583929296.404:5156): pid=21551 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir594627509/syzkaller.aVXX3g/269/file0" dev="sda1" ino=16551 res=1 audit: type=1800 audit(1583929296.404:5157): pid=21551 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=16551 res=0 audit: type=1400 audit(1583929296.694:5158): avc: denied { map } for pid=21561 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1583929296.714:5159): avc: denied { map } for pid=21561 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1583929296.724:5160): avc: denied { map } for pid=21561 comm="blkid" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1583929296.724:5161): avc: denied { map } for pid=21561 comm="blkid" path="/lib/x86_64-linux-gnu/ld-2.13.so" dev="sda1" ino=2668 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1400 audit(1583929296.734:5162): avc: denied { map } for pid=21561 comm="blkid" path="/etc/ld.so.cache" dev="sda1" ino=2251 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 audit: type=1804 audit(1583929296.734:5163): pid=21558 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir164034204/syzkaller.nGr3sp/294/bus" dev="sda1" ino=17341 res=1 audit: type=1804 audit(1583929296.734:5164): pid=21563 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="ToMToU" comm="syz-executor.5" name="/root/syzkaller-testdir164034204/syzkaller.nGr3sp/294/bus" dev="sda1" ino=17341 res=1 audit: type=1400 audit(1583929296.754:5165): avc: denied { map } for pid=21561 comm="blkid" path="/lib/x86_64-linux-gnu/libblkid.so.1.1.0" dev="sda1" ino=2825 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 binder: 21571:21573 ioctl c0306201 0 returned -14