i2c i2c-1: dtv_property_process_get: GET cmd 0x00000031 (DTV_ATSCMH_SGN) len 0: i2c i2c-1: dtv_property_process_get: GET cmd 0x0000002b (DTV_DVBT2_PLP_ID_LEGACY) len 0: ================================================================== BUG: KASAN: slab-out-of-bounds in hex_string+0x480/0x4d0 lib/vsprintf.c:1209 Read of size 1 at addr ffff888027e2f17c by task syz.0.17/5909 CPU: 1 UID: 0 PID: 5909 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 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:1209 pointer+0x3f2/0xe50 lib/vsprintf.c:2548 vsnprintf+0x649/0x1300 lib/vsprintf.c:2953 va_format+0x14e/0x4b0 lib/vsprintf.c:1725 pointer+0x929/0xe50 lib/vsprintf.c:2577 vsnprintf+0x649/0x1300 lib/vsprintf.c:2953 vscnprintf+0x40/0x90 lib/vsprintf.c:3018 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: 0033:0x7fa5be39e1d9 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:00007ffc36151398 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa5be625fa0 RCX: 00007fa5be39e1d9 RDX: 0000200000000c00 RSI: 0000000080106f53 RDI: 0000000000000004 RBP: 00007fa5be435888 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa5be625fac R14: 00007fa5be625fa0 R15: 00007fa5be625fa0 Allocated by task 5909: 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:5414 [inline] __kmalloc_node_track_caller_noprof+0x33d/0x870 mm/slub.c:5545 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 ffff888027e2f000 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 [ffff888027e2f000, ffff888027e2f17c) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27e2c 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 ffff88801d042c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801d042c80 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 5154, tgid 5154 (udevadm), ts 14211752025 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab mm/slub.c:3462 [inline] new_slab+0xa9/0x6e0 mm/slub.c:3513 refill_objects+0xe3/0x410 mm/slub.c:7418 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __kmalloc_cache_noprof+0x4f4/0x6d0 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] kernfs_fop_open+0x23d/0xd50 fs/kernfs/file.c:634 do_dentry_open+0x6ab/0x14d0 fs/open.c:996 vfs_open+0x82/0x3f0 fs/open.c:1101 do_open fs/namei.c:4866 [inline] path_openat+0x19fa/0x2440 fs/namei.c:5029 do_file_open+0x20e/0x430 fs/namei.c:5058 do_sys_openat2+0x10f/0x1e0 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_sys_openat fs/open.c:1439 [inline] __se_sys_openat fs/open.c:1434 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1434 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 page last free pid 5154 tgid 5154 ts 13802966446 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962 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:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] __kmalloc_cache_noprof+0x278/0x6d0 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] inode_doinit_use_xattr+0x54/0x330 security/selinux/hooks.c:1386 inode_doinit_with_dentry+0x10fc/0x1340 security/selinux/hooks.c:1581 selinux_d_instantiate+0x26/0x40 security/selinux/hooks.c:6807 security_d_instantiate+0x14c/0x1b0 security/security.c:3703 d_splice_alias_ops+0xd7/0x15b0 fs/dcache.c:3255 kernfs_iop_lookup+0x23f/0x2d0 fs/kernfs/dir.c:1288 __lookup_slow+0x155/0x320 fs/namei.c:1919 lookup_slow+0x50/0x70 fs/namei.c:1936 walk_component fs/namei.c:2311 [inline] lookup_last fs/namei.c:2818 [inline] path_lookupat+0x5e8/0xc40 fs/namei.c:2842 filename_lookup+0x202/0x590 fs/namei.c:2871 vfs_statx+0xff/0x3f0 fs/stat.c:353 Memory state around the buggy address: ffff888027e2f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888027e2f080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888027e2f100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 04 ^ ffff888027e2f180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888027e2f200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================