IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready ================================================================== BUG: KASAN: use-after-free in drm_getunique+0x19e/0x250 drivers/gpu/drm/drm_ioctl.c:117 Read of size 4 at addr ffff8800ab872018 by task syz-executor.2/10279 CPU: 0 PID: 10279 Comm: syz-executor.2 Not tainted 4.18.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x15a/0x20d lib/dump_stack.c:113 print_address_description.cold.6+0x9/0x244 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold.7+0x242/0x305 mm/kasan/report.c:396 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 drm_getunique+0x19e/0x250 drivers/gpu/drm/drm_ioctl.c:117 drm_ioctl_kernel+0x1b7/0x240 drivers/gpu/drm/drm_ioctl.c:744 drm_ioctl+0x66a/0xa30 drivers/gpu/drm/drm_ioctl.c:840 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684 ksys_ioctl+0x62/0x90 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5aa666d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9 RDX: 0000000020000180 RSI: 00000000c0145401 RDI: 0000000000000003 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffdc996b9df R14: 00007f5aa666d300 R15: 0000000000022000 Allocated by task 10271: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:553 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:538 kmem_cache_alloc_trace+0x142/0x350 mm/slub.c:2735 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] drm_master_create+0x42/0x550 drivers/gpu/drm/drm_auth.c:101 drm_new_set_master+0xd0/0x2e0 drivers/gpu/drm/drm_auth.c:146 drm_master_open+0xd6/0x110 drivers/gpu/drm/drm_auth.c:255 drm_open_helper drivers/gpu/drm/drm_file.c:251 [inline] drm_open+0x81c/0x1010 drivers/gpu/drm/drm_file.c:155 drm_stub_open+0x260/0x430 drivers/gpu/drm/drm_drv.c:942 chrdev_open+0x1ed/0x5c0 fs/char_dev.c:417 do_dentry_open+0x3da/0xd50 fs/open.c:794 vfs_open+0xfc/0x240 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x919/0x2290 fs/namei.c:3540 do_filp_open+0x177/0x250 fs/namei.c:3574 do_sys_open+0x1dc/0x360 fs/open.c:1101 __do_sys_openat fs/open.c:1128 [inline] __se_sys_openat fs/open.c:1122 [inline] __x64_sys_openat+0x98/0xf0 fs/open.c:1122 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 10271: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x167/0x240 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 slab_free_hook mm/slub.c:1373 [inline] slab_free_freelist_hook mm/slub.c:1400 [inline] slab_free mm/slub.c:2955 [inline] kfree+0x130/0x3b0 mm/slub.c:3908 drm_master_destroy drivers/gpu/drm/drm_auth.c:354 [inline] kref_put include/linux/kref.h:70 [inline] drm_master_put+0x172/0x200 drivers/gpu/drm/drm_auth.c:365 drm_new_set_master+0x19d/0x2e0 drivers/gpu/drm/drm_auth.c:165 drm_setmaster_ioctl+0x10c/0x190 drivers/gpu/drm/drm_auth.c:197 drm_ioctl_kernel+0x1b7/0x240 drivers/gpu/drm/drm_ioctl.c:744 drm_ioctl+0x66a/0xa30 drivers/gpu/drm/drm_ioctl.c:840 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684 ksys_ioctl+0x62/0x90 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8800ab872000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of 512-byte region [ffff8800ab872000, ffff8800ab872200) The buggy address belongs to the page: page:ffffea0002ae1c80 count:1 mapcount:0 mapping:ffff8800b6002c00 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 0000000000000000 0000000100000001 ffff8800b6002c00 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page allocated via order 1, migratetype Unmovable, gfp_mask 0x152c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:1906 [inline] prep_new_page mm/page_alloc.c:1914 [inline] get_page_from_freelist+0x2f35/0x46b0 mm/page_alloc.c:3345 __alloc_pages_nodemask+0x39e/0x2780 mm/page_alloc.c:4369 alloc_pages_current+0xd6/0x1b0 mm/mempolicy.c:2093 alloc_pages include/linux/gfp.h:492 [inline] alloc_slab_page mm/slub.c:1440 [inline] allocate_slab mm/slub.c:1585 [inline] new_slab+0x4a9/0x850 mm/slub.c:1656 new_slab_objects mm/slub.c:2419 [inline] ___slab_alloc+0x609/0x940 mm/slub.c:2571 __slab_alloc.isra.22+0x78/0xe0 mm/slub.c:2611 slab_alloc_node mm/slub.c:2674 [inline] __kmalloc_node_track_caller+0xea/0x460 mm/slub.c:4322 __kmalloc_reserve.isra.8+0x2c/0xc0 net/core/skbuff.c:137 __alloc_skb+0xd7/0x580 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:987 [inline] alloc_uevent_skb+0x84/0x220 lib/kobject_uevent.c:288 uevent_net_broadcast_untagged lib/kobject_uevent.c:324 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:406 [inline] kobject_uevent_env+0x7ad/0x1080 lib/kobject_uevent.c:587 kobject_synth_uevent+0x5d9/0x833 lib/kobject_uevent.c:208 uevent_store+0x39/0x60 drivers/base/bus.c:614 drv_attr_store+0x67/0xb0 drivers/base/bus.c:73 sysfs_kf_write+0xfd/0x150 fs/sysfs/file.c:139 kernfs_fop_write+0x255/0x410 fs/kernfs/file.c:316 Memory state around the buggy address: ffff8800ab871f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8800ab871f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8800ab872000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8800ab872080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8800ab872100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================