================================================================== BUG: KASAN: use-after-free in drm_gem_object_release_handle+0x3d/0xb0 drivers/gpu/drm/drm_gem.c:238 Read of size 8 at addr ffff8880217f11e8 by task syz-executor.2/27423 CPU: 0 PID: 27423 Comm: syz-executor.2 Not tainted 6.0.0-rc6-syzkaller-00286-ga63f2e7cb110 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x220 mm/kasan/report.c:433 kasan_report+0xfb/0x130 mm/kasan/report.c:495 drm_gem_object_release_handle+0x3d/0xb0 drivers/gpu/drm/drm_gem.c:238 idr_for_each+0x1f8/0x2e0 lib/idr.c:208 drm_gem_release+0x21/0x30 drivers/gpu/drm/drm_gem.c:917 drm_file_free+0x6ac/0x920 drivers/gpu/drm/drm_file.c:281 drm_close_helper drivers/gpu/drm/drm_file.c:308 [inline] drm_release+0x33e/0x5c0 drivers/gpu/drm/drm_file.c:495 __fput+0x3b9/0x820 fs/file_table.c:320 task_work_run+0x146/0x1c0 kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x55e/0x20a0 kernel/exit.c:795 do_group_exit+0x23b/0x2f0 kernel/exit.c:925 get_signal+0x172f/0x1780 kernel/signal.c:2857 arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:166 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f390588a669 Code: Unable to access opcode bytes at RIP 0x7f390588a63f. RSP: 002b:00007f39069e0218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f39059abf88 RCX: 00007f390588a669 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f39059abf8c RBP: 00007f39059abf80 R08: 0000000000000010 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f39059abf8c R13: 00007fff52c2db7f R14: 00007f39069e0300 R15: 0000000000022000 Allocated by task 27423: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] kmem_cache_alloc_trace+0x97/0x310 mm/slub.c:3289 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] vgem_gem_create_object+0x46/0xa0 drivers/gpu/drm/vgem/vgem_drv.c:98 __drm_gem_shmem_create+0x7c/0x310 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+0x243/0x420 drivers/gpu/drm/drm_gem_shmem_helper.c:534 drm_ioctl_kernel+0x33e/0x4f0 drivers/gpu/drm/drm_ioctl.c:782 drm_ioctl+0x626/0xa10 drivers/gpu/drm/drm_ioctl.c:885 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 27423: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xda/0x210 mm/slub.c:4567 drm_gem_object_free drivers/gpu/drm/drm_gem.c:959 [inline] kref_put include/linux/kref.h:65 [inline] __drm_gem_object_put include/drm/drm_gem.h:381 [inline] drm_gem_object_put include/drm/drm_gem.h:394 [inline] drm_gem_mmap+0x4c9/0x760 drivers/gpu/drm/drm_gem.c:1119 call_mmap include/linux/fs.h:2192 [inline] mmap_region+0x10b2/0x16f0 mm/mmap.c:1752 do_mmap+0x7a7/0xdf0 mm/mmap.c:1540 vm_mmap_pgoff+0x1e5/0x2f0 mm/util.c:552 ksys_mmap_pgoff+0x48c/0x6d0 mm/mmap.c:1586 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 kvfree_call_rcu+0x119/0x800 kernel/rcu/tree.c:3322 neigh_del net/core/neighbour.c:225 [inline] neigh_remove_one+0x5cc/0x680 net/core/neighbour.c:246 neigh_forced_gc net/core/neighbour.c:276 [inline] neigh_alloc net/core/neighbour.c:447 [inline] ___neigh_create+0x3aa/0x21a0 net/core/neighbour.c:642 ip6_finish_output2+0x1508/0x1530 net/ipv6/ip6_output.c:125 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline] ip6_finish_output+0xa05/0xeb0 net/ipv6/ip6_output.c:206 dst_output include/net/dst.h:451 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0xaca/0xfd0 net/ipv6/ndisc.c:508 addrconf_dad_completed+0x6dd/0xc90 net/ipv6/addrconf.c:4248 addrconf_dad_work+0xdb4/0x16e0 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff8880217f1000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 488 bytes inside of 1024-byte region [ffff8880217f1000, ffff8880217f1400) The buggy address belongs to the physical page: page:ffffea000085fc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x217f0 head:ffffea000085fc00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888012041dc0 raw: 0000000000000000 0000000080100010 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 3608, tgid 3605 (syz-fuzzer), ts 203309447166, free_ts 203308478248 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5515 alloc_slab_page+0x70/0xf0 mm/slub.c:1829 allocate_slab+0x5e/0x520 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3036 __slab_alloc mm/slub.c:3123 [inline] slab_alloc_node mm/slub.c:3214 [inline] __kmalloc_node_track_caller+0x2c3/0x400 mm/slub.c:4964 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0x11d/0x620 net/core/skbuff.c:434 alloc_skb include/linux/skbuff.h:1257 [inline] __tcp_send_ack+0x98/0x5f0 net/ipv4/tcp_output.c:3955 tcp_cleanup_rbuf net/ipv4/tcp.c:1628 [inline] tcp_recvmsg_locked+0x1cf8/0x25f0 net/ipv4/tcp.c:2649 tcp_recvmsg+0x22b/0x8b0 net/ipv4/tcp.c:2679 inet_recvmsg+0x13a/0x250 net/ipv4/af_inet.c:850 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_read_iter+0x3fa/0x530 net/socket.c:1086 call_read_iter include/linux/fs.h:2181 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7cf/0xbc0 fs/read_write.c:470 ksys_read+0x19b/0x2c0 fs/read_write.c:607 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 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:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x630 mm/page_alloc.c:3476 skb_free_frag include/linux/skbuff.h:3185 [inline] skb_free_head net/core/skbuff.c:660 [inline] skb_release_data+0x65c/0x790 net/core/skbuff.c:691 skb_release_all net/core/skbuff.c:756 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:770 tcp_eat_recv_skb net/ipv4/tcp.c:1638 [inline] tcp_recvmsg_locked+0x14b2/0x25f0 net/ipv4/tcp.c:2633 tcp_recvmsg+0x22b/0x8b0 net/ipv4/tcp.c:2679 inet_recvmsg+0x13a/0x250 net/ipv4/af_inet.c:850 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_read_iter+0x3fa/0x530 net/socket.c:1086 call_read_iter include/linux/fs.h:2181 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x7cf/0xbc0 fs/read_write.c:470 ksys_read+0x19b/0x2c0 fs/read_write.c:607 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff8880217f1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880217f1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880217f1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880217f1200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880217f1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================