================================================================== BUG: KASAN: use-after-free in dev_put include/linux/netdevice.h:3382 [inline] BUG: KASAN: use-after-free in netdevice_event_work_handler+0x1c1/0x1d0 drivers/infiniband/core/roce_gid_mgmt.c:539 Read of size 8 at addr ffff8880b4d0b200 by task kworker/u4:34/11851 CPU: 0 PID: 11851 Comm: kworker/u4:34 Not tainted 4.14.299-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: gid-cache-wq netdevice_event_work_handler Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 dev_put include/linux/netdevice.h:3382 [inline] netdevice_event_work_handler+0x1c1/0x1d0 drivers/infiniband/core/roce_gid_mgmt.c:539 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 Allocated by task 11739: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x4c/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:530 [inline] kvmalloc_node+0x46/0xd0 mm/util.c:430 kvmalloc include/linux/mm.h:531 [inline] kvzalloc include/linux/mm.h:539 [inline] alloc_netdev_mqs+0x76/0xb70 net/core/dev.c:8112 rtnl_create_link+0x1ab/0x890 net/core/rtnetlink.c:2460 rtnl_newlink+0xe7a/0x1830 net/core/rtnetlink.c:2720 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2454 netlink_unicast_kernel net/netlink/af_netlink.c:1296 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1322 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 Freed by task 11739: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 kvfree+0x45/0x50 mm/util.c:449 device_release+0x15f/0x1a0 drivers/base/core.c:848 kobject_cleanup lib/kobject.c:646 [inline] kobject_release lib/kobject.c:675 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put+0x251/0x550 lib/kobject.c:692 put_device+0x1c/0x30 drivers/base/core.c:2030 free_netdev+0x26f/0x360 net/core/dev.c:8234 rtnl_newlink+0x14cd/0x1830 net/core/rtnetlink.c:2746 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2454 netlink_unicast_kernel net/netlink/af_netlink.c:1296 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1322 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1893 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 The buggy address belongs to the object at ffff8880b4d0acc0 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 1344 bytes inside of 4096-byte region [ffff8880b4d0acc0, ffff8880b4d0bcc0) The buggy address belongs to the page: page:ffffea0002d34280 count:1 mapcount:0 mapping:ffff8880b4d0acc0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff8880b4d0acc0 0000000000000000 0000000100000001 raw: ffffea0002d177a0 ffffea0002592520 ffff88813fe74dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880b4d0b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880b4d0b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb UDF-fs: warning (device loop0): udf_load_vrs: No VRS found >ffff8880b4d0b200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880b4d0b280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880b4d0b300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop0): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 1024 failed BTRFS: device fsid 8ff932b8-f4e4-4b03-aed6-d7e5736fd60a devid 1 transid 8 /dev/loop3