i2c i2c-1: dtv_property_process_get: GET cmd 0x0000003d (DTV_LNA) len 32: ff ff ff ff 78 dc fe 7b 31 54 88 a6 e4 04 8b 6a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== BUG: KASAN: slab-out-of-bounds in hex_string+0x480/0x4d0 lib/vsprintf.c:1208 Read of size 1 at addr ffff88803741957c by task syz.2.626/7892 CPU: 1 UID: 0 PID: 7892 Comm: syz.2.626 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 hex_string+0x480/0x4d0 lib/vsprintf.c:1208 pointer+0x3f2/0xe50 lib/vsprintf.c:2547 vsnprintf+0x649/0x1300 lib/vsprintf.c:2952 va_format+0x14e/0x4b0 lib/vsprintf.c:1724 pointer+0x929/0xe50 lib/vsprintf.c:2576 vsnprintf+0x649/0x1300 lib/vsprintf.c:2952 vscnprintf+0x40/0x90 lib/vsprintf.c:3017 printk_sprint+0x31/0x330 kernel/printk/printk.c:2222 vprintk_store+0x507/0xbe0 kernel/printk/printk.c:2364 vprintk_emit+0x139/0x6b0 kernel/printk/printk.c:2455 dev_vprintk_emit+0x391/0x3e0 drivers/base/core.c:5000 dev_printk_emit+0xd2/0x10d drivers/base/core.c:5011 __dynamic_dev_dbg+0x252/0x310 lib/dynamic_debug.c:904 dtv_property_process_get.isra.0+0xf40/0x3690 drivers/media/dvb-core/dvb_frontend.c:1595 dvb_get_property.isra.0+0x273/0x690 drivers/media/dvb-core/dvb_frontend.c:2397 dvb_frontend_handle_ioctl+0x138c/0x2f00 drivers/media/dvb-core/dvb_frontend.c:2478 dvb_frontend_do_ioctl+0x1ce/0x320 drivers/media/dvb-core/dvb_frontend.c:2101 dvb_usercopy+0x167/0x340 drivers/media/dvb-core/dvbdev.c:996 dvb_frontend_ioctl+0x50/0x80 drivers/media/dvb-core/dvb_frontend.c:2115 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff57499f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff575800028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff574c25fa0 RCX: 00007ff57499f559 RDX: 0000200000002100 RSI: 0000000080106f53 RDI: 0000000000000004 RBP: 00007ff574a36b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff574c26038 R14: 00007ff574c25fa0 R15: 00007ffc7a079958 Allocated by task 7892: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5531 [inline] __kmalloc_node_track_caller_noprof+0x33d/0x870 mm/slub.c:5662 memdup_user+0x2a/0xe0 mm/util.c:221 memdup_array_user include/linux/string.h:39 [inline] dvb_get_property.isra.0+0x162/0x690 drivers/media/dvb-core/dvb_frontend.c:2380 dvb_frontend_handle_ioctl+0x138c/0x2f00 drivers/media/dvb-core/dvb_frontend.c:2478 dvb_frontend_do_ioctl+0x1ce/0x320 drivers/media/dvb-core/dvb_frontend.c:2101 dvb_usercopy+0x167/0x340 drivers/media/dvb-core/dvbdev.c:996 dvb_frontend_ioctl+0x50/0x80 drivers/media/dvb-core/dvb_frontend.c:2115 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888037419400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes to the right of allocated 380-byte region [ffff888037419400, ffff88803741957c) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x37418 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801d442c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801d442c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 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 5789, tgid 5789 (syz-executor), ts 51014019455 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1856 prep_new_page mm/page_alloc.c:1864 [inline] get_page_from_freelist+0x1113/0x35e0 mm/page_alloc.c:3935 __alloc_frozen_pages_noprof+0x2bd/0x3280 mm/page_alloc.c:5444 alloc_slab_page mm/slub.c:3384 [inline] allocate_slab mm/slub.c:3499 [inline] new_slab+0xb1/0x6d0 mm/slub.c:3550 refill_objects+0xe3/0x410 mm/slub.c:7539 refill_sheaf mm/slub.c:2917 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4811 alloc_from_pcs mm/slub.c:4887 [inline] slab_alloc_node mm/slub.c:5021 [inline] __do_kmalloc_node mm/slub.c:5530 [inline] __kmalloc_noprof+0x677/0x840 mm/slub.c:5556 _kmalloc_noprof include/linux/slab.h:995 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x14c/0xad0 net/ipv6/route.c:3811 addrconf_f6i_alloc+0x2d9/0x670 net/ipv6/route.c:4698 ipv6_add_addr+0x577/0x20e0 net/ipv6/addrconf.c:1135 addrconf_add_linklocal+0x2ae/0x510 net/ipv6/addrconf.c:3352 addrconf_addr_gen+0x364/0x3b0 net/ipv6/addrconf.c:3488 addrconf_dev_config net/ipv6/addrconf.c:3535 [inline] addrconf_init_auto_addrs+0x1cb/0x780 net/ipv6/addrconf.c:3613 addrconf_notify+0x10af/0x1ba0 net/ipv6/addrconf.c:3793 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:86 page last free pid 5202 tgid 5202 ts 15664921074 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1403 [inline] __free_frozen_pages+0x7b4/0x1110 mm/page_alloc.c:2954 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:5033 [inline] __do_kmalloc_node mm/slub.c:5530 [inline] __kmalloc_noprof+0x2cc/0x840 mm/slub.c:5556 _kmalloc_noprof include/linux/slab.h:995 [inline] tomoyo_realpath_from_path+0xb6/0x690 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x276/0x460 security/tomoyo/file.c:827 security_inode_getattr+0x116/0x280 security/security.c:1917 vfs_getattr fs/stat.c:263 [inline] vfs_statx_path fs/stat.c:303 [inline] vfs_statx+0x11f/0x3f0 fs/stat.c:360 vfs_fstatat+0x77/0xe0 fs/stat.c:377 __do_sys_newfstatat+0x9d/0x120 fs/stat.c:542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888037419400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888037419480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888037419500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04 ^ ffff888037419580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888037419600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================