================================================================== BUG: KASAN: use-after-free in drm_gem_object_release_handle drivers/gpu/drm/drm_gem.c:239 [inline] BUG: KASAN: use-after-free in drm_gem_handle_delete+0x14d/0x170 drivers/gpu/drm/drm_gem.c:273 Read of size 8 at addr ffff88806f3839e8 by task syz-executor.2/9445 CPU: 0 PID: 9445 Comm: syz-executor.2 Not tainted 6.1.0-rc8-syzkaller-00003-gbce9332220bd #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 drivers/gpu/drm/drm_gem.c:239 [inline] drm_gem_handle_delete+0x14d/0x170 drivers/gpu/drm/drm_gem.c:273 drm_mode_destroy_dumb drivers/gpu/drm/drm_dumb_buffers.c:145 [inline] drm_mode_destroy_dumb_ioctl+0xf6/0x140 drivers/gpu/drm/drm_dumb_buffers.c:153 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 RIP: 0033:0x7fd8c4e8c0d9 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:00007fd8c5c7a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd8c4fac050 RCX: 00007fd8c4e8c0d9 RDX: 0000000020000200 RSI: 00000000c00464b4 RDI: 0000000000000003 RBP: 00007fd8c4ee7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd8c50cfb1f R14: 00007fd8c5c7a300 R15: 0000000000022000 Allocated by task 9429: 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 9429: 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:2204 [inline] mmap_region+0x6c3/0x1dd0 mm/mmap.c:2622 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 call_rcu+0x9d/0x820 kernel/rcu/tree.c:2798 sctp_transport_destroy net/sctp/transport.c:171 [inline] sctp_transport_put+0x121/0x180 net/sctp/transport.c:483 sctp_association_free+0x4d0/0x7d0 net/sctp/associola.c:381 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1328 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x33ff/0x5290 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x38a/0x6c0 net/sctp/associola.c:1053 sctp_inq_push+0x1d6/0x270 net/sctp/inqueue.c:80 sctp_backlog_rcv+0x19a/0x5b0 net/sctp/input.c:346 sk_backlog_rcv include/net/sock.h:1109 [inline] __release_sock+0x133/0x3b0 net/core/sock.c:2906 release_sock+0x58/0x1b0 net/core/sock.c:3462 sctp_wait_for_connect+0x416/0x5c0 net/sctp/socket.c:9310 __sctp_connect+0x9a1/0xc30 net/sctp/socket.c:1245 sctp_connect net/sctp/socket.c:4805 [inline] sctp_inet_connect+0x161/0x200 net/sctp/socket.c:4820 __sys_connect_file+0x153/0x1a0 net/socket.c:1976 __sys_connect+0x165/0x1a0 net/socket.c:1993 __do_sys_connect net/socket.c:2003 [inline] __se_sys_connect net/socket.c:2000 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2000 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 Second to 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 call_rcu+0x9d/0x820 kernel/rcu/tree.c:2798 sctp_transport_destroy net/sctp/transport.c:171 [inline] sctp_transport_put+0x121/0x180 net/sctp/transport.c:483 sctp_association_free+0x4d0/0x7d0 net/sctp/associola.c:381 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1328 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x33ff/0x5290 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x38a/0x6c0 net/sctp/associola.c:1053 sctp_inq_push+0x1d6/0x270 net/sctp/inqueue.c:80 sctp_backlog_rcv+0x19a/0x5b0 net/sctp/input.c:346 sk_backlog_rcv include/net/sock.h:1109 [inline] __release_sock+0x133/0x3b0 net/core/sock.c:2906 release_sock+0x58/0x1b0 net/core/sock.c:3462 sctp_wait_for_connect+0x416/0x5c0 net/sctp/socket.c:9310 __sctp_connect+0x9a1/0xc30 net/sctp/socket.c:1245 sctp_connect net/sctp/socket.c:4805 [inline] sctp_inet_connect+0x161/0x200 net/sctp/socket.c:4820 __sys_connect_file+0x153/0x1a0 net/socket.c:1976 __sys_connect+0x165/0x1a0 net/socket.c:1993 __do_sys_connect net/socket.c:2003 [inline] __se_sys_connect net/socket.c:2000 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:2000 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 ffff88806f383800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 488 bytes inside of 1024-byte region [ffff88806f383800, ffff88806f383c00) The buggy address belongs to the physical page: page:ffffea0001bce000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6f380 head:ffffea0001bce000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000082c400 dead000000000002 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 3632, tgid 3625 (syz-fuzzer), ts 128136782354, free_ts 127157131782 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+0x25f/0x350 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_cleanup_rbuf+0x356/0x470 net/ipv4/tcp.c:1617 tcp_recvmsg_locked+0x72c/0x22c0 net/ipv4/tcp.c:2649 tcp_recvmsg+0x117/0x620 net/ipv4/tcp.c:2679 inet_recvmsg+0x114/0x5e0 net/ipv4/af_inet.c:861 sock_recvmsg_nosec net/socket.c:995 [inline] sock_recvmsg net/socket.c:1013 [inline] sock_recvmsg net/socket.c:1009 [inline] sock_read_iter+0x348/0x480 net/socket.c:1086 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: ffff88806f383880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806f383900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806f383980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806f383a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806f383a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================