RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffc000 RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000100000000 R10: 0000000000000012 R11: 0000000000000246 R12: 00007ffea6f5def0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ================================================================== BUG: KASAN: use-after-free in drm_gem_object_release_handle+0x3b/0xf0 drivers/gpu/drm/drm_gem.c:253 Read of size 8 at addr ffff8880228f8a28 by task syz-executor356/3604 CPU: 0 PID: 3604 Comm: syz-executor356 Not tainted 5.18.0-rc7-syzkaller-00119-gb015dcd62b86 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:313 print_report+0xf4/0x210 mm/kasan/report.c:429 kasan_report+0xfb/0x130 mm/kasan/report.c:491 drm_gem_object_release_handle+0x3b/0xf0 drivers/gpu/drm/drm_gem.c:253 idr_for_each+0x1f8/0x2e0 lib/idr.c:208 drm_gem_release+0x21/0x30 drivers/gpu/drm/drm_gem.c:931 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:317 task_work_run+0x146/0x1c0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:37 [inline] do_exit+0x547/0x1eb0 kernel/exit.c:795 do_group_exit+0x23b/0x2f0 kernel/exit.c:925 __do_sys_exit_group kernel/exit.c:936 [inline] __se_sys_exit_group kernel/exit.c:934 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:934 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+0x44/0xae RIP: 0033:0x7fe09e8dee19 Code: Unable to access opcode bytes at RIP 0x7fe09e8dedef. RSP: 002b:00007ffea6f5df58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fe09e9523f0 RCX: 00007fe09e8dee19 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000100000000 R10: 0000000000000012 R11: 0000000000000246 R12: 00007fe09e9523f0 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 Allocated by task 3604: 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:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:234 [inline] kmem_cache_alloc_trace+0x94/0x310 mm/slub.c:3258 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [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:423 [inline] drm_gem_shmem_dumb_create+0x243/0x420 drivers/gpu/drm/drm_gem_shmem_helper.c:533 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+0x44/0xae Freed by task 3604: 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+0xd8/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1754 slab_free mm/slub.c:3510 [inline] kfree+0xc6/0x210 mm/slub.c:4552 drm_gem_object_free drivers/gpu/drm/drm_gem.c:973 [inline] kref_put include/linux/kref.h:65 [inline] __drm_gem_object_put include/drm/drm_gem.h:371 [inline] drm_gem_object_put include/drm/drm_gem.h:384 [inline] drm_gem_mmap+0x4c9/0x760 drivers/gpu/drm/drm_gem.c:1133 call_mmap include/linux/fs.h:2055 [inline] mmap_region+0x11ff/0x1730 mm/mmap.c:1791 do_mmap+0x7a7/0xdf0 mm/mmap.c:1582 vm_mmap_pgoff+0x1e5/0x2f0 mm/util.c:519 ksys_mmap_pgoff+0x48c/0x6d0 mm/mmap.c:1628 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+0x44/0xae The buggy address belongs to the object at ffff8880228f8800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 552 bytes inside of 1024-byte region [ffff8880228f8800, ffff8880228f8c00) The buggy address belongs to the physical page: page:ffffea00008a3e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x228f8 head:ffffea00008a3e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011441dc0 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3599, tgid 3599 (sshd), ts 45730919026, free_ts 45679182628 prep_new_page mm/page_alloc.c:2441 [inline] get_page_from_freelist+0x72e/0x7a0 mm/page_alloc.c:4182 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5408 alloc_slab_page+0x70/0xf0 mm/slub.c:1799 allocate_slab+0x5e/0x560 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x41e/0xcd0 mm/slub.c:3005 __slab_alloc mm/slub.c:3092 [inline] slab_alloc_node mm/slub.c:3183 [inline] __kmalloc_node_track_caller+0x2bb/0x3f0 mm/slub.c:4947 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x11a/0x590 net/core/skbuff.c:426 alloc_skb_fclone include/linux/skbuff.h:1350 [inline] tcp_stream_alloc_skb+0x67/0x480 net/ipv4/tcp.c:863 tcp_sendmsg_locked+0xd64/0x3fc0 net/ipv4/tcp.c:1298 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1449 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg net/socket.c:725 [inline] sock_write_iter+0x37c/0x4e0 net/socket.c:1061 call_write_iter include/linux/fs.h:2050 [inline] new_sync_write fs/read_write.c:504 [inline] vfs_write+0xa22/0xd40 fs/read_write.c:591 ksys_write+0x19b/0x2c0 fs/read_write.c:644 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+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1356 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3328 [inline] free_unref_page+0x7d/0x390 mm/page_alloc.c:3423 do_slab_free mm/slub.c:3498 [inline] ___cache_free+0x118/0x1a0 mm/slub.c:3517 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:749 [inline] slab_alloc_node mm/slub.c:3217 [inline] slab_alloc mm/slub.c:3225 [inline] __kmem_cache_alloc_lru mm/slub.c:3232 [inline] kmem_cache_alloc+0x199/0x2f0 mm/slub.c:3242 getname_flags+0xb8/0x4e0 fs/namei.c:138 vfs_fstatat fs/stat.c:254 [inline] __do_sys_newfstatat fs/stat.c:425 [inline] __se_sys_newfstatat+0xd4/0x790 fs/stat.c:419 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+0x44/0xae Memory state around the buggy address: ffff8880228f8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880228f8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880228f8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880228f8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880228f8b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================