================================================================== BUG: KASAN: slab-use-after-free in skb_dst_drop include/net/dst.h:274 [inline] BUG: KASAN: slab-use-after-free in skb_release_head_state+0x283/0x2b0 net/core/skbuff.c:1157 Read of size 8 at addr ffff88803a7c0b98 by task syz.0.599/7528 CPU: 1 PID: 7528 Comm: syz.0.599 Not tainted 6.10.0-rc7-syzkaller-00254-g528dd46d0fc3 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 skb_dst_drop include/net/dst.h:274 [inline] skb_release_head_state+0x283/0x2b0 net/core/skbuff.c:1157 skb_release_all net/core/skbuff.c:1171 [inline] __kfree_skb net/core/skbuff.c:1187 [inline] kfree_skb_reason+0xed/0x210 net/core/skbuff.c:1223 kfree_skb include/linux/skbuff.h:1257 [inline] __hci_req_sync+0x61d/0x980 net/bluetooth/hci_request.c:184 hci_req_sync+0x97/0xd0 net/bluetooth/hci_request.c:206 hci_inquiry+0x3ea/0x950 net/bluetooth/hci_core.c:383 hci_sock_ioctl+0x2bb/0x880 net/bluetooth/hci_sock.c:1153 sock_do_ioctl+0x116/0x280 net/socket.c:1222 sock_ioctl+0x22e/0x6c0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f63af775bd9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f63b060f048 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f63af903f60 RCX: 00007f63af775bd9 RDX: 00000000200000c0 RSI: 00000000800448f0 RDI: 0000000000000009 RBP: 00007f63af7e4e60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f63af903f60 R15: 00007ffec3f794f8 Allocated by task 5206: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3940 [inline] slab_alloc_node mm/slub.c:4002 [inline] kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4009 skb_clone+0x190/0x3f0 net/core/skbuff.c:2052 hci_send_cmd_sync net/bluetooth/hci_core.c:4091 [inline] hci_cmd_work+0x66a/0x710 net/bluetooth/hci_core.c:4111 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248 process_scheduled_works kernel/workqueue.c:3329 [inline] worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 4636: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4438 [inline] kmem_cache_free+0x12f/0x3a0 mm/slub.c:4513 kfree_skbmem+0x10e/0x200 net/core/skbuff.c:1131 __kfree_skb net/core/skbuff.c:1188 [inline] kfree_skb_reason+0x138/0x210 net/core/skbuff.c:1223 kfree_skb include/linux/skbuff.h:1257 [inline] hci_send_cmd_sync net/bluetooth/hci_core.c:4090 [inline] hci_cmd_work+0x63e/0x710 net/bluetooth/hci_core.c:4111 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248 process_scheduled_works kernel/workqueue.c:3329 [inline] worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff88803a7c0b40 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 88 bytes inside of freed 240-byte region [ffff88803a7c0b40, ffff88803a7c0c30) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3a7c0 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 00fff00000000040 ffff8880196d2780 ffffea000058f100 dead000000000003 raw: 0000000000000000 0000000000190019 00000001ffffefff 0000000000000000 head: 00fff00000000040 ffff8880196d2780 ffffea000058f100 dead000000000003 head: 0000000000000000 0000000000190019 00000001ffffefff 0000000000000000 head: 00fff00000000001 ffffea0000e9f001 ffffffffffffffff 0000000000000000 head: 0000000700000002 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 29, tgid 29 (ksoftirqd/1), ts 55305780237, free_ts 55204066008 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1473 prep_new_page mm/page_alloc.c:1481 [inline] get_page_from_freelist+0x1353/0x2e50 mm/page_alloc.c:3425 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4683 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x56/0x110 mm/slub.c:2265 allocate_slab mm/slub.c:2428 [inline] new_slab+0x84/0x260 mm/slub.c:2481 ___slab_alloc+0xdac/0x1870 mm/slub.c:3667 __kmem_cache_alloc_bulk mm/slub.c:4724 [inline] kmem_cache_alloc_bulk_noprof+0x257/0x930 mm/slub.c:4796 napi_skb_cache_get+0x154/0x210 net/core/skbuff.c:346 __napi_build_skb+0x14/0x50 net/core/skbuff.c:525 napi_alloc_skb+0x2b8/0x5a0 net/core/skbuff.c:843 e1000_alloc_rx_skb drivers/net/ethernet/intel/e1000/e1000_main.c:4110 [inline] e1000_copybreak drivers/net/ethernet/intel/e1000/e1000_main.c:4326 [inline] e1000_clean_rx_irq+0x2bc/0x1160 drivers/net/ethernet/intel/e1000/e1000_main.c:4378 e1000_clean+0x960/0x26f0 drivers/net/ethernet/intel/e1000/e1000_main.c:3801 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6722 napi_poll net/core/dev.c:6791 [inline] net_rx_action+0x9b6/0xf10 net/core/dev.c:6907 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 run_ksoftirqd kernel/softirq.c:928 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:920 page last free pid 5173 tgid 5173 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1093 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2588 __folio_put+0x239/0x360 mm/swap.c:129 folio_put include/linux/mm.h:1513 [inline] put_page include/linux/mm.h:1585 [inline] skb_page_unref include/linux/skbuff_ref.h:44 [inline] __skb_frag_unref include/linux/skbuff_ref.h:57 [inline] skb_release_data+0x5df/0x980 net/core/skbuff.c:1102 skb_release_all net/core/skbuff.c:1173 [inline] __napi_kfree_skb net/core/skbuff.c:1451 [inline] kfree_skb_napi_cache net/core/skbuff.c:7007 [inline] skb_attempt_defer_free+0x1b0/0x620 net/core/skbuff.c:7029 tcp_eat_recv_skb net/ipv4/tcp.c:1520 [inline] tcp_recvmsg_locked+0x11cd/0x2700 net/ipv4/tcp.c:2544 tcp_recvmsg+0x12e/0x680 net/ipv4/tcp.c:2590 inet_recvmsg+0x12b/0x6a0 net/ipv4/af_inet.c:885 sock_recvmsg_nosec net/socket.c:1046 [inline] sock_recvmsg+0x1b2/0x250 net/socket.c:1068 sock_read_iter+0x2c7/0x3c0 net/socket.c:1138 new_sync_read fs/read_write.c:395 [inline] vfs_read+0xa39/0xbd0 fs/read_write.c:476 ksys_read+0x1f8/0x260 fs/read_write.c:619 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803a7c0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff88803a7c0b00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff88803a7c0b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803a7c0c00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ffff88803a7c0c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================