================================================================== BUG: KASAN: slab-use-after-free in skb_update_prio net/core/dev.c:3891 [inline] BUG: KASAN: slab-use-after-free in __dev_queue_xmit+0x39bc/0x3db0 net/core/dev.c:4171 Read of size 8 at addr ffff88807d73ab90 by task aoe_tx0/1213 CPU: 0 PID: 1213 Comm: aoe_tx0 Not tainted 6.2.0-syzkaller-12835-gfb07390463c9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319 print_report mm/kasan/report.c:430 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:536 skb_update_prio net/core/dev.c:3891 [inline] __dev_queue_xmit+0x39bc/0x3db0 net/core/dev.c:4171 dev_queue_xmit include/linux/netdevice.h:3051 [inline] tx+0x76/0x100 drivers/block/aoe/aoenet.c:63 kthread+0x1eb/0x3b0 drivers/block/aoe/aoecmd.c:1229 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 11644: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node+0x5d/0xd0 mm/slab_common.c:974 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:603 kvmalloc include/linux/slab.h:737 [inline] kvzalloc include/linux/slab.h:745 [inline] alloc_netdev_mqs+0x9c/0x1250 net/core/dev.c:10587 rtnl_create_link+0xbeb/0xee0 net/core/rtnetlink.c:3312 rtnl_newlink_create net/core/rtnetlink.c:3430 [inline] __rtnl_newlink+0xfd4/0x1840 net/core/rtnetlink.c:3657 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3670 rtnetlink_rcv_msg+0x43d/0xd50 net/core/rtnetlink.c:6174 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:722 [inline] sock_sendmsg+0xde/0x190 net/socket.c:745 ____sys_sendmsg+0x71c/0x900 net/socket.c:2504 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2558 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2587 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 11644: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x2d0 mm/slub.c:3800 kvfree+0x46/0x50 mm/util.c:649 device_release+0xa3/0x240 drivers/base/core.c:2436 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c2/0x4d0 lib/kobject.c:729 netdev_run_todo+0x762/0x1100 net/core/dev.c:10361 rtnl_unlock net/core/rtnetlink.c:148 [inline] rtnetlink_rcv_msg+0x44a/0xd50 net/core/rtnetlink.c:6175 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:722 [inline] sock_sendmsg+0xde/0x190 net/socket.c:745 ____sys_sendmsg+0x71c/0x900 net/socket.c:2504 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2558 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2587 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807d73a000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 2960 bytes inside of freed 4096-byte region [ffff88807d73a000, ffff88807d73b000) The buggy address belongs to the physical page: page:ffffea0001f5ce00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d738 head:ffffea0001f5ce00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff88801244f500 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5170, tgid 5170 (udevd), ts 1422305068747, free_ts 1422303000867 prep_new_page mm/page_alloc.c:2552 [inline] get_page_from_freelist+0x1190/0x2f80 mm/page_alloc.c:4325 __alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5591 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x136/0x330 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc_node+0x4d/0xd0 mm/slab_common.c:974 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:603 kvmalloc include/linux/slab.h:737 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x7fb/0x12d0 fs/seq_file.c:210 proc_reg_read_iter+0x115/0x2d0 fs/proc/inode.c:301 call_read_iter include/linux/fs.h:1845 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x681/0x930 fs/read_write.c:470 ksys_read+0x12b/0x250 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1453 [inline] free_pcp_prepare+0x668/0xb50 mm/page_alloc.c:1503 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3482 __folio_put_large mm/swap.c:119 [inline] __folio_put+0x109/0x140 mm/swap.c:127 folio_put include/linux/mm.h:1309 [inline] put_page+0x21b/0x280 include/linux/mm.h:1378 page_to_skb+0x7fc/0xa00 drivers/net/virtio_net.c:543 receive_mergeable drivers/net/virtio_net.c:1251 [inline] receive_buf+0x11b2/0x6180 drivers/net/virtio_net.c:1386 virtnet_receive drivers/net/virtio_net.c:1684 [inline] virtnet_poll+0x704/0x1300 drivers/net/virtio_net.c:1802 __napi_poll+0xb8/0x870 net/core/dev.c:6482 napi_poll net/core/dev.c:6549 [inline] net_rx_action+0x9fd/0xdc0 net/core/dev.c:6659 __do_softirq+0x2e3/0xae3 kernel/softirq.c:571 Memory state around the buggy address: ffff88807d73aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d73ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807d73ab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d73ac00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d73ac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================