================================================================== BUG: KASAN: use-after-free in drm_gem_object_release_handle+0xa1/0xb0 drivers/gpu/drm/drm_gem.c:239 Read of size 8 at addr ffff888026a029e8 by task syz-executor.5/14760 CPU: 0 PID: 14760 Comm: syz-executor.5 Not tainted 6.1.0-rc3-syzkaller-00158-gee6050c8af96 #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+0xcd/0x134 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+0xbb/0x1f0 mm/kasan/report.c:495 drm_gem_object_release_handle+0xa1/0xb0 drivers/gpu/drm/drm_gem.c:239 idr_for_each+0x113/0x220 lib/idr.c:208 drm_gem_release+0x22/0x30 drivers/gpu/drm/drm_gem.c:918 drm_file_free+0x7bb/0xb90 drivers/gpu/drm/drm_file.c:276 drm_release+0x1a6/0x4d0 drivers/gpu/drm/drm_file.c:490 __fput+0x27c/0xa90 fs/file_table.c:320 task_work_run+0x16b/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f3801a3d37b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffc64f7d290 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f3801a3d37b RDX: 00007f3801600288 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007f3801bad980 R08: 0000000000000000 R09: 00007f3801600000 R10: 00007f3801600290 R11: 0000000000000293 R12: 00000000000eb21f R13: 00007ffc64f7d390 R14: 00007f3801babf80 R15: 0000000000000032 Allocated by task 14766: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:576 [inline] kzalloc include/linux/slab.h:712 [inline] vgem_gem_create_object+0x38/0xb0 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+0x13c/0x380 drivers/gpu/drm/drm_gem_shmem_helper.c:534 drm_mode_create_dumb+0x26c/0x2f0 drivers/gpu/drm/drm_dumb_buffers.c:96 drm_ioctl_kernel+0x27d/0x4e0 drivers/gpu/drm/drm_ioctl.c:788 drm_ioctl+0x3e2/0xa30 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+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 14766: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/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+0xab/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+0x4f6/0x770 drivers/gpu/drm/drm_gem.c:1121 call_mmap include/linux/fs.h:2196 [inline] mmap_region+0x6bf/0x1c00 mm/mmap.c:2625 do_mmap+0x825/0xf50 mm/mmap.c:1412 vm_mmap_pgoff+0x1ab/0x270 mm/util.c:520 ksys_mmap_pgoff+0x41b/0x5a0 mm/mmap.c:1458 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 call_rcu+0x99/0x820 kernel/rcu/tree.c:2798 sctp_transport_destroy net/sctp/transport.c:171 [inline] sctp_transport_put+0x11d/0x180 net/sctp/transport.c:483 sctp_association_free+0x4cc/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+0x385c/0x4ec0 net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x386/0x6c0 net/sctp/associola.c:1053 sctp_inq_push+0x1d2/0x270 net/sctp/inqueue.c:80 sctp_backlog_rcv+0x196/0x5a0 net/sctp/input.c:346 sk_backlog_rcv include/net/sock.h:1109 [inline] __release_sock+0x12f/0x3a0 net/core/sock.c:2906 release_sock+0x54/0x1b0 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+0x15d/0x200 net/sctp/socket.c:4820 __sys_connect_file+0x14f/0x190 net/socket.c:1976 __sys_connect+0x161/0x190 net/socket.c:1993 __do_sys_connect net/socket.c:2003 [inline] __se_sys_connect net/socket.c:2000 [inline] __x64_sys_connect+0x6f/0xb0 net/socket.c:2000 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888026a02800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 488 bytes inside of 1024-byte region [ffff888026a02800, ffff888026a02c00) The buggy address belongs to the physical page: page:ffffea00009a8000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888026a05800 pfn:0x26a00 head:ffffea00009a8000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00009e1e00 dead000000000002 ffff888011841dc0 raw: ffff888026a05800 000000008010000e 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 0, tgid 0 (swapper/0), ts 173361639944, free_ts 173361418014 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4288 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5555 alloc_pages+0x1a6/0x270 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+0x191/0x3e0 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x45/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0xd9/0x2f0 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+0x7d/0xa0 net/ipv4/tcp_output.c:3992 __tcp_ack_snd_check+0x156/0x9c0 net/ipv4/tcp_input.c:5524 tcp_rcv_established+0x1bc3/0x2230 net/ipv4/tcp_input.c:5968 tcp_v4_do_rcv+0x66c/0x9b0 net/ipv4/tcp_ipv4.c:1681 tcp_v4_rcv+0x36a9/0x3980 net/ipv4/tcp_ipv4.c:2102 ip_protocol_deliver_rcu+0x9b/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+0x19/0x4d0 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+0x145/0x280 net/core/skbuff.c:1089 skb_defer_free_flush net/core/dev.c:6646 [inline] net_rx_action+0x342/0xde0 net/core/dev.c:6667 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571 Memory state around the buggy address: ffff888026a02880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888026a02900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888026a02980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888026a02a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888026a02a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================