Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout ================================================================== BUG: KASAN: use-after-free in vgem_gem_dumb_create+0x200/0x210 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/vgem/vgem_drv.c:215 Read of size 8 at addr ffff8880964bb140 by task syz-executor.1/10202 CPU: 0 PID: 10202 Comm: syz-executor.1 Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:351 kasan_report syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:430 vgem_gem_dumb_create+0x200/0x210 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/vgem/vgem_drv.c:215 drm_mode_create_dumb_ioctl+0x221/0x2b0 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_dumb_buffers.c:92 drm_ioctl_kernel+0x14c/0x200 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_ioctl.c:736 drm_ioctl+0x419/0x870 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_ioctl.c:836 vfs_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:46 [inline] file_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:684 SYSC_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465d99 RSP: 002b:00007f8fb316e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465d99 RDX: 00000000200000c0 RSI: 00000000c02064b2 RDI: 0000000000000003 RBP: 00000000004bcf27 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffcd0bbaaaf R14: 00007f8fb316e300 R15: 0000000000022000 Allocated by task 10202: save_stack syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:447 [inline] set_track syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 syzkaller/managers/linux-4-14/kernel/mm/slab.c:3618 kmalloc syzkaller/managers/linux-4-14/kernel/./include/linux/slab.h:488 [inline] kzalloc syzkaller/managers/linux-4-14/kernel/./include/linux/slab.h:661 [inline] __vgem_gem_create+0x44/0xe0 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/vgem/vgem_drv.c:159 vgem_gem_create syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/vgem/vgem_drv.c:188 [inline] vgem_gem_dumb_create+0xc5/0x210 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/vgem/vgem_drv.c:211 drm_mode_create_dumb_ioctl+0x221/0x2b0 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_dumb_buffers.c:92 drm_ioctl_kernel+0x14c/0x200 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_ioctl.c:736 drm_ioctl+0x419/0x870 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_ioctl.c:836 vfs_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:46 [inline] file_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:684 SYSC_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 10202: save_stack syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:447 [inline] set_track syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:524 __cache_free syzkaller/managers/linux-4-14/kernel/mm/slab.c:3496 [inline] kfree+0xc9/0x250 syzkaller/managers/linux-4-14/kernel/mm/slab.c:3815 drm_gem_object_free+0x8f/0x150 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_gem.c:836 kref_put syzkaller/managers/linux-4-14/kernel/./include/linux/kref.h:70 [inline] drm_gem_object_put_unlocked+0xc3/0x160 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_gem.c:865 vgem_gem_create syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/vgem/vgem_drv.c:193 [inline] vgem_gem_dumb_create+0xf2/0x210 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/vgem/vgem_drv.c:211 drm_mode_create_dumb_ioctl+0x221/0x2b0 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_dumb_buffers.c:92 drm_ioctl_kernel+0x14c/0x200 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_ioctl.c:736 drm_ioctl+0x419/0x870 syzkaller/managers/linux-4-14/kernel/drivers/gpu/drm/drm_ioctl.c:836 vfs_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:46 [inline] file_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:684 SYSC_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff8880964bb040 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 256 bytes inside of 512-byte region [ffff8880964bb040, ffff8880964bb240) The buggy address belongs to the page: page:ffffea0002592ec0 count:1 mapcount:0 mapping:ffff8880964bb040 index:0xffff8880964bb7c0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffff8880964bb040 ffff8880964bb7c0 0000000100000003 raw: ffffea0002af40a0 ffffea0002d29b20 ffff88813fe80940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880964bb000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8880964bb080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880964bb100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880964bb180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880964bb200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================