Please use ioctl(SG_SUBMIT_V3) instead of write(), See: http://sg.danny.cz/sg/sg_v40.html ================================================================== BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3161 [inline] BUG: KASAN: double-free or invalid-free in kfree+0xe5/0x7f0 mm/slub.c:4215 CPU: 1 PID: 12318 Comm: syz-executor.0 Not tainted 5.12.0-rc2-next-20210312-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 kasan_report_invalid_free+0x51/0x80 mm/kasan/report.c:357 ____kasan_slab_free mm/kasan/common.c:340 [inline] __kasan_slab_free+0x118/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7f0 mm/slub.c:4215 scsi_req_free_cmd include/scsi/scsi_request.h:28 [inline] sg_finish_scsi_blk_rq+0x690/0x810 drivers/scsi/sg.c:3224 sg_common_write+0xa07/0xe70 drivers/scsi/sg.c:1132 sg_v3_submit+0x3b1/0x530 drivers/scsi/sg.c:797 sg_write.part.0+0xaf8/0xec0 drivers/scsi/sg.c:660 sg_write+0x87/0x120 drivers/scsi/sg.c:603 vfs_write+0x28e/0xa30 fs/read_write.c:603 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 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:00007ff92b6cd188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 00000000000000ab RSI: 0000000020000540 RDI: 0000000000000004 RBP: 00000000004bfa8f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff16415caf R14: 00007ff92b6cd300 R15: 0000000000022000 Allocated by task 12318: 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:427 [inline] ____kasan_kmalloc mm/kasan/common.c:506 [inline] ____kasan_kmalloc mm/kasan/common.c:465 [inline] __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:686 [inline] sg_start_req+0x16f/0x24e0 drivers/scsi/sg.c:3044 sg_common_write+0x5fd/0xe70 drivers/scsi/sg.c:1109 sg_v3_submit+0x3b1/0x530 drivers/scsi/sg.c:797 sg_write.part.0+0xaf8/0xec0 drivers/scsi/sg.c:660 sg_write+0x87/0x120 drivers/scsi/sg.c:603 vfs_write+0x28e/0xa30 fs/read_write.c:603 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 12318: 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:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x92/0x210 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kfree+0xe5/0x7f0 mm/slub.c:4215 sg_start_req+0x1b33/0x24e0 drivers/scsi/sg.c:3106 sg_common_write+0x5fd/0xe70 drivers/scsi/sg.c:1109 sg_v3_submit+0x3b1/0x530 drivers/scsi/sg.c:797 sg_write.part.0+0xaf8/0xec0 drivers/scsi/sg.c:660 sg_write+0x87/0x120 drivers/scsi/sg.c:603 vfs_write+0x28e/0xa30 fs/read_write.c:603 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 __call_rcu kernel/rcu/tree.c:3038 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3113 free_fib_info net/ipv4/fib_semantics.c:256 [inline] fib_create_info+0x1fee/0x4870 net/ipv4/fib_semantics.c:1549 fib_table_insert+0x1cd/0x1af0 net/ipv4/fib_trie.c:1224 fib_magic+0x3b9/0x520 net/ipv4/fib_frontend.c:1085 fib_add_ifaddr+0x493/0x520 net/ipv4/fib_frontend.c:1129 fib_netdev_event+0x488/0x670 net/ipv4/fib_frontend.c:1466 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2063 call_netdevice_notifiers_extack net/core/dev.c:2075 [inline] call_netdevice_notifiers net/core/dev.c:2089 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8696 dev_change_flags+0x112/0x170 net/core/dev.c:8734 do_setlink+0x89a/0x3a70 net/core/rtnetlink.c:2708 __rtnl_newlink+0xdc6/0x1710 net/core/rtnetlink.c:3376 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 __sys_sendto+0x21c/0x320 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1985 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88802d0be800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of 256-byte region [ffff88802d0be800, ffff88802d0be900) The buggy address belongs to the page: page:ffffea0000b42f80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2d0be head:ffffea0000b42f80 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 ffffea0000962c80 0000000900000005 ffff888010841b40 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88802d0be700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802d0be780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802d0be800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802d0be880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802d0be900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================