================================================================== BUG: KASAN: use-after-free in drm_gem_object_release_handle+0xa5/0xb0 drivers/gpu/drm/drm_gem.c:239 Read of size 8 at addr ffff8880766341e8 by task syz-executor.5/25902 CPU: 1 PID: 25902 Comm: syz-executor.5 Not tainted 6.1.0-rc6-syzkaller-00315-gfaf68e3523c2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 drm_gem_object_release_handle+0xa5/0xb0 drivers/gpu/drm/drm_gem.c:239 idr_for_each+0x117/0x230 lib/idr.c:208 drm_gem_release+0x26/0x40 drivers/gpu/drm/drm_gem.c:918 drm_file_free.part.0+0x806/0xb50 drivers/gpu/drm/drm_file.c:276 drm_file_free drivers/gpu/drm/drm_file.c:243 [inline] drm_close_helper.isra.0+0x17d/0x1f0 drivers/gpu/drm/drm_file.c:303 drm_release+0x1e9/0x4a0 drivers/gpu/drm/drm_file.c:490 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16f/0x270 kernel/task_work.c:179 get_signal+0x1c7/0x2440 kernel/signal.c:2635 arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f72cb48c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f72cc1ca168 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: fffffffffffffff4 RBX: 00007f72cb5abf80 RCX: 00007f72cb48c0d9 RDX: 0000000000000000 RSI: 0000000000003028 RDI: 0000000020ffc000 RBP: 00007f72cc1ca1d0 R08: 0000000000000003 R09: 0000000100000000 R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd505e0b9f R14: 00007f72cc1ca300 R15: 0000000000022000 Allocated by task 25902: 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:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:553 [inline] kzalloc include/linux/slab.h:689 [inline] vgem_gem_create_object+0x3c/0xb0 drivers/gpu/drm/vgem/vgem_drv.c:98 __drm_gem_shmem_create+0x80/0x480 drivers/gpu/drm/drm_gem_shmem_helper.c:62 drm_gem_shmem_create drivers/gpu/drm/drm_gem_shmem_helper.c:127 [inline] drm_gem_shmem_create_with_handle drivers/gpu/drm/drm_gem_shmem_helper.c:424 [inline] drm_gem_shmem_dumb_create+0x140/0x380 drivers/gpu/drm/drm_gem_shmem_helper.c:534 drm_mode_create_dumb+0x270/0x300 drivers/gpu/drm/drm_dumb_buffers.c:96 drm_ioctl_kernel+0x281/0x4e0 drivers/gpu/drm/drm_ioctl.c:788 drm_ioctl+0x51a/0x980 drivers/gpu/drm/drm_ioctl.c:891 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 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 25902: 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:511 ____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:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3674 drm_gem_object_free drivers/gpu/drm/drm_gem.c:961 [inline] kref_put include/linux/kref.h:65 [inline] __drm_gem_object_put include/drm/drm_gem.h:430 [inline] drm_gem_object_put include/drm/drm_gem.h:443 [inline] drm_gem_mmap+0x4fa/0x770 drivers/gpu/drm/drm_gem.c:1121 call_mmap include/linux/fs.h:2196 [inline] mmap_region+0x6c3/0x1dd0 mm/mmap.c:2625 do_mmap+0x831/0xf60 mm/mmap.c:1412 vm_mmap_pgoff+0x1af/0x280 mm/util.c:520 ksys_mmap_pgoff+0x41f/0x5a0 mm/mmap.c:1458 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 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 kvfree_call_rcu+0x78/0x8f0 kernel/rcu/tree.c:3343 neigh_destroy+0x435/0x640 net/core/neighbour.c:931 neigh_release include/net/neighbour.h:449 [inline] neigh_cleanup_and_release+0x271/0x3d0 net/core/neighbour.c:103 neigh_del net/core/neighbour.c:225 [inline] neigh_remove_one+0x381/0x460 net/core/neighbour.c:246 neigh_forced_gc net/core/neighbour.c:276 [inline] neigh_alloc net/core/neighbour.c:466 [inline] ___neigh_create+0x191f/0x2a20 net/core/neighbour.c:661 ip6_finish_output2+0xfc4/0x1530 net/ipv6/ip6_output.c:125 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] ip6_finish_output+0x694/0x1170 net/ipv6/ip6_output.c:206 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227 dst_output include/net/dst.h:445 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ndisc_send_skb+0xa63/0x1740 net/ipv6/ndisc.c:508 ndisc_send_rs+0x132/0x6f0 net/ipv6/ndisc.c:718 addrconf_rs_timer+0x3f1/0x810 net/ipv6/addrconf.c:3931 call_timer_fn+0x1da/0x7c0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x6a2/0xaf0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb7/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 The buggy address belongs to the object at ffff888076634000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 488 bytes inside of 1024-byte region [ffff888076634000, ffff888076634400) The buggy address belongs to the physical page: page:ffffea0001d98c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x76630 head:ffffea0001d98c00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00009b5e00 dead000000000003 ffff888012041dc0 raw: 0000000000000000 0000000000100010 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 21, tgid 21 (ksoftirqd/1), ts 139287109529, free_ts 139286910338 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5558 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1794 [inline] allocate_slab+0x213/0x300 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3180 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x199/0x3e0 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x4b/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0xdd/0x300 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] __tcp_send_ack.part.0+0x67/0x760 net/ipv4/tcp_output.c:3960 __tcp_send_ack net/ipv4/tcp_output.c:3992 [inline] tcp_send_ack+0x81/0xa0 net/ipv4/tcp_output.c:3992 __tcp_ack_snd_check+0x156/0x9c0 net/ipv4/tcp_input.c:5524 tcp_ack_snd_check net/ipv4/tcp_input.c:5570 [inline] tcp_rcv_established+0x992/0x2230 net/ipv4/tcp_input.c:6008 tcp_v4_do_rcv+0x670/0x9b0 net/ipv4/tcp_ipv4.c:1670 tcp_v4_rcv+0x36ad/0x3980 net/ipv4/tcp_ipv4.c:2091 ip_protocol_deliver_rcu+0x9f/0x7c0 net/ipv4/ip_input.c:205 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 skb_free_frag include/linux/skbuff.h:3190 [inline] skb_free_head+0x96/0x110 net/core/skbuff.c:758 skb_release_data+0x5f1/0x870 net/core/skbuff.c:789 skb_release_all net/core/skbuff.c:854 [inline] napi_consume_skb net/core/skbuff.c:1111 [inline] napi_consume_skb+0x149/0x280 net/core/skbuff.c:1089 skb_defer_free_flush net/core/dev.c:6646 [inline] net_rx_action+0x346/0xde0 net/core/dev.c:6667 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 Memory state around the buggy address: ffff888076634080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888076634100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888076634180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888076634200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888076634280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================