================================================================== 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 ffff88807a1549e8 by task syz-executor.3/5927 CPU: 1 PID: 5927 Comm: syz-executor.3 Not tainted 6.0.0-rc5-syzkaller-00025-g3245cb65fd91 #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 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:169 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: 0033:0x7fd57f23c04b 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:00007ffc35825850 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007fd57f23c04b RDX: 00007fd57f3a0428 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007fd57f39d980 R08: 0000000000000000 R09: 00007fd57f3a0430 R10: 00007ffc35825950 R11: 0000000000000293 R12: 00000000000f281c R13: 00007ffc35825950 R14: 00007fd57f39bf80 R15: 0000000000000032 Allocated by task 5929: 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:3284 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 5929: 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:1754 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1780 slab_free mm/slub.c:3534 [inline] kfree+0xda/0x210 mm/slub.c:4562 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 The buggy address belongs to the object at ffff88807a154800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 488 bytes inside of 1024-byte region [ffff88807a154800, ffff88807a154c00) The buggy address belongs to the physical page: page:ffffea0001e85400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a150 head:ffffea0001e85400 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 3605, tgid 3598 (syz-fuzzer), ts 144777044563, free_ts 144408865871 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:1824 allocate_slab+0x5e/0x520 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3031 __slab_alloc mm/slub.c:3118 [inline] slab_alloc_node mm/slub.c:3209 [inline] __kmalloc_node_track_caller+0x2bd/0x3f0 mm/slub.c:4955 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:2640 tcp_recvmsg+0x22b/0x8b0 net/ipv4/tcp.c:2670 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 free_slab mm/slub.c:2068 [inline] discard_slab mm/slub.c:2074 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2548 put_cpu_partial+0x116/0x180 mm/slub.c:2624 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3243 [inline] slab_alloc mm/slub.c:3251 [inline] __kmem_cache_alloc_lru mm/slub.c:3258 [inline] kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3268 ptlock_alloc+0x1c/0x60 mm/memory.c:5774 ptlock_init include/linux/mm.h:2261 [inline] pgtable_pte_page_ctor include/linux/mm.h:2288 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:66 [inline] pte_alloc_one+0xd1/0x360 arch/x86/mm/pgtable.c:33 __pte_alloc+0x75/0x210 mm/memory.c:468 do_anonymous_page+0xe03/0x1150 mm/memory.c:4052 handle_pte_fault mm/memory.c:4909 [inline] __handle_mm_fault mm/memory.c:5053 [inline] handle_mm_fault+0x186b/0x35c0 mm/memory.c:5151 do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1488 [inline] exc_page_fault+0x7a/0x120 arch/x86/mm/fault.c:1544 asm_exc_page_fault+0x22/0x30 Memory state around the buggy address: ffff88807a154880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807a154900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807a154980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807a154a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807a154a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================