================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline] BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline] BUG: KASAN: use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:173 [inline] BUG: KASAN: use-after-free in mutex_lock+0x7f/0xe0 kernel/locking/mutex.c:298 Write of size 8 at addr ffff888126dc9840 by task syz.3.295/1465 CPU: 1 PID: 1465 Comm: syz.3.295 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x280/0x290 mm/kasan/generic.c:189 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic64_try_cmpxchg_acquire include/asm-generic/atomic-instrumented.h:1515 [inline] atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:443 [inline] __mutex_trylock_fast kernel/locking/mutex.c:173 [inline] mutex_lock+0x7f/0xe0 kernel/locking/mutex.c:298 steam_input_open+0x91/0x160 drivers/hid/hid-steam.c:297 input_open_device+0x14c/0x2a0 drivers/input/input.c:635 evdev_open_device drivers/input/evdev.c:400 [inline] evdev_open+0x4d2/0x5e0 drivers/input/evdev.c:487 chrdev_open+0x597/0x670 fs/char_dev.c:414 do_dentry_open+0x793/0x1090 fs/open.c:819 vfs_open+0x73/0x80 fs/open.c:942 do_open fs/namei.c:3391 [inline] path_openat+0x27ad/0x3160 fs/namei.c:3509 do_filp_open+0x1b3/0x3e0 fs/namei.c:3536 do_sys_openat2+0x14c/0x6d0 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_openat fs/open.c:1249 [inline] __se_sys_openat fs/open.c:1244 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1244 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f92be059510 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44 RSP: 002b:00007f92bcac2b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000008080 RCX: 00007f92be059510 RDX: 0000000000008080 RSI: 00007f92bcac2c10 RDI: 00000000ffffff9c RBP: 00007f92bcac2c10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd R13: 00007f92be2a2038 R14: 00007f92be2a1fa0 R15: 00007ffe3c047cd8 Allocated by task 0: (stack is not available) Freed by task 95: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kfree+0xc0/0x270 mm/slub.c:4196 skb_free_head net/core/skbuff.c:606 [inline] skb_release_data+0x532/0x670 net/core/skbuff.c:626 skb_release_all net/core/skbuff.c:680 [inline] __kfree_skb net/core/skbuff.c:694 [inline] consume_skb+0xab/0x1f0 net/core/skbuff.c:851 skb_free_datagram+0x28/0xe0 net/core/datagram.c:325 unix_dgram_recvmsg+0x9c0/0xd40 net/unix/af_unix.c:2233 ____sys_recvmsg+0x291/0x580 net/socket.c:-1 ___sys_recvmsg+0x1af/0x4f0 net/socket.c:2637 __sys_recvmsg net/socket.c:2667 [inline] __do_sys_recvmsg net/socket.c:2677 [inline] __se_sys_recvmsg net/socket.c:2674 [inline] __x64_sys_recvmsg+0x1dd/0x2a0 net/socket.c:2674 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888126dc9800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 64 bytes inside of 512-byte region [ffff888126dc9800, ffff888126dc9a00) The buggy address belongs to the page: page:ffffea00049b7200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x126dc8 head:ffffea00049b7200 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea00049a5400 0000000500000005 ffff888100043080 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 276, ts 24096429215, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5370 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2a6/0x450 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc_trace+0x1b3/0x2e0 mm/slub.c:2977 kmalloc include/linux/slab.h:552 [inline] kmalloc_array include/linux/slab.h:591 [inline] rtnl_newlink+0x103/0x1640 net/core/rtnetlink.c:3526 rtnetlink_rcv_msg+0x9db/0xb90 net/core/rtnetlink.c:5610 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2503 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5628 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x88d/0xb30 net/netlink/af_netlink.c:1914 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] __sys_sendto+0x41d/0x580 net/socket.c:2006 __do_sys_sendto net/socket.c:2018 [inline] __se_sys_sendto net/socket.c:2014 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:2014 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 page_owner free stack trace missing Memory state around the buggy address: ffff888126dc9700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888126dc9780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888126dc9800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888126dc9880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888126dc9900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== general protection fault, probably for non-canonical address 0xdffffc0000000213: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x0000000000001098-0x000000000000109f] CPU: 0 PID: 1465 Comm: syz.3.295 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 RIP: 0010:steam_send_report+0x66/0x310 drivers/hid/hid-steam.c:172 Code: 80 3c 18 00 74 12 4c 89 f7 e8 f6 34 3f fe 48 ba 00 00 00 00 00 fc ff df 4d 8b 26 49 8d 9c 24 98 10 00 00 48 89 d8 48 c1 e8 03 <80> 3c 10 00 74 12 48 89 df e8 cc 34 3f fe 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900014e7668 EFLAGS: 00010202 RAX: 0000000000000213 RBX: 0000000000001098 RCX: 0000000000000282 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff888126dc9830 RBP: ffffc900014e76b0 R08: dffffc0000000000 R09: fffff5200029cec9 R10: fffff5200029cec9 R11: 1ffff9200029cec8 R12: 0000000000000000 R13: 1ffff9200029ced8 R14: ffff888126dc9830 R15: ffffc900014e76e0 FS: 00007f92bcac36c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f80e2d14d58 CR3: 0000000136ff3000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: steam_send_report_byte drivers/hid/hid-steam.c:212 [inline] steam_set_lizard_mode drivers/hid/hid-steam.c:285 [inline] steam_input_open+0xde/0x160 drivers/hid/hid-steam.c:299 input_open_device+0x14c/0x2a0 drivers/input/input.c:635 evdev_open_device drivers/input/evdev.c:400 [inline] evdev_open+0x4d2/0x5e0 drivers/input/evdev.c:487 chrdev_open+0x597/0x670 fs/char_dev.c:414 do_dentry_open+0x793/0x1090 fs/open.c:819 vfs_open+0x73/0x80 fs/open.c:942 do_open fs/namei.c:3391 [inline] path_openat+0x27ad/0x3160 fs/namei.c:3509 do_filp_open+0x1b3/0x3e0 fs/namei.c:3536 do_sys_openat2+0x14c/0x6d0 fs/open.c:1217 do_sys_open fs/open.c:1233 [inline] __do_sys_openat fs/open.c:1249 [inline] __se_sys_openat fs/open.c:1244 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1244 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f92be059510 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44 RSP: 002b:00007f92bcac2b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000008080 RCX: 00007f92be059510 RDX: 0000000000008080 RSI: 00007f92bcac2c10 RDI: 00000000ffffff9c RBP: 00007f92bcac2c10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd R13: 00007f92be2a2038 R14: 00007f92be2a1fa0 R15: 00007ffe3c047cd8 Modules linked in: ---[ end trace 11f8ade34b030298 ]--- RIP: 0010:steam_send_report+0x66/0x310 drivers/hid/hid-steam.c:172 Code: 80 3c 18 00 74 12 4c 89 f7 e8 f6 34 3f fe 48 ba 00 00 00 00 00 fc ff df 4d 8b 26 49 8d 9c 24 98 10 00 00 48 89 d8 48 c1 e8 03 <80> 3c 10 00 74 12 48 89 df e8 cc 34 3f fe 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900014e7668 EFLAGS: 00010202 RAX: 0000000000000213 RBX: 0000000000001098 RCX: 0000000000000282 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff888126dc9830 RBP: ffffc900014e76b0 R08: dffffc0000000000 R09: fffff5200029cec9 R10: fffff5200029cec9 R11: 1ffff9200029cec8 R12: 0000000000000000 R13: 1ffff9200029ced8 R14: ffff888126dc9830 R15: ffffc900014e76e0 FS: 00007f92bcac36c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd6901cff98 CR3: 0000000136ff3000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 4: 74 12 je 0x18 6: 4c 89 f7 mov %r14,%rdi 9: e8 f6 34 3f fe call 0xfe3f3504 e: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 15: fc ff df 18: 4d 8b 26 mov (%r14),%r12 1b: 49 8d 9c 24 98 10 00 lea 0x1098(%r12),%rbx 22: 00 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2e: 74 12 je 0x42 30: 48 89 df mov %rbx,%rdi 33: e8 cc 34 3f fe call 0xfe3f3504 38: 48 rex.W 39: ba 00 00 00 00 mov $0x0,%edx 3e: 00 fc add %bh,%ah