================================================================== 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 ffff88814801d9e8 by task syz-executor.3/1100 CPU: 0 PID: 1100 Comm: syz-executor.3 Not tainted 6.1.0-rc7-syzkaller-00122-g355479c70a48 #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 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+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: 0033:0x7f72c263df8b 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:00007f72c28cfb80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f72c263df8b RDX: 00007f72c22003a8 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007f72c27ad980 R08: 0000000000000000 R09: 00007f72c2200000 R10: 00007f72c22003b0 R11: 0000000000000293 R12: 00000000001fe4f7 R13: 00007f72c28cfc80 R14: 00007f72c27ac050 R15: 0000000000000032 Allocated by task 1108: 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 1108: 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: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 put_css_set_locked kernel/cgroup/cgroup.c:989 [inline] put_css_set_locked+0xaa0/0x1000 kernel/cgroup/cgroup.c:955 cgroup_migrate_finish+0x189/0x650 kernel/cgroup/cgroup.c:2707 cgroup_attach_task+0x42d/0x880 kernel/cgroup/cgroup.c:2908 cgroup_attach_task_all+0xe0/0x140 kernel/cgroup/cgroup-v1.c:70 kvm_vm_worker_thread+0x306/0x5a0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:6067 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff88814801d800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 488 bytes inside of 1024-byte region [ffff88814801d800, ffff88814801dc00) The buggy address belongs to the physical page: page:ffffea0005200600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x148018 head:ffffea0005200600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000010200 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 27563, tgid 27562 (syz-executor.3), ts 2001014155735, free_ts 1495766703089 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_node include/linux/gfp.h:223 [inline] alloc_slab_page mm/slub.c:1796 [inline] allocate_slab+0x80/0x300 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 kmalloc_node_trace+0x21/0x60 mm/slab_common.c:1058 kmalloc_node include/linux/slab.h:575 [inline] kzalloc_node include/linux/slab.h:700 [inline] io_wq_create+0x493/0xd80 io_uring/io-wq.c:1164 io_init_wq_offload io_uring/tctx.c:44 [inline] io_uring_alloc_task_context+0x2ed/0x550 io_uring/tctx.c:76 __io_uring_add_tctx_node.cold+0x19/0x184 io_uring/tctx.c:101 io_uring_install_fd io_uring/io_uring.c:3359 [inline] io_uring_create io_uring/io_uring.c:3559 [inline] io_uring_setup.cold+0x18e9/0x1ac8 io_uring/io_uring.c:3599 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 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 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x184/0x210 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc_lru+0x258/0x740 mm/slub.c:3429 alloc_inode_sb include/linux/fs.h:3125 [inline] shmem_alloc_inode+0x27/0x50 mm/shmem.c:3853 alloc_inode+0x61/0x230 fs/inode.c:259 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x2b/0x280 fs/inode.c:1046 shmem_get_inode+0x19b/0xe40 mm/shmem.c:2329 shmem_mknod+0x60/0x210 mm/shmem.c:2910 shmem_mkdir+0x30/0x60 mm/shmem.c:2964 vfs_mkdir+0x48d/0x740 fs/namei.c:4036 do_mkdirat+0x290/0x310 fs/namei.c:4061 __do_sys_mkdirat fs/namei.c:4076 [inline] __se_sys_mkdirat fs/namei.c:4074 [inline] __x64_sys_mkdirat+0x119/0x170 fs/namei.c:4074 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88814801d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88814801d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88814801d980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88814801da00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88814801da80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================