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BUG: KASAN: global-out-of-bounds in dvb_device_open+0xe8/0x370 drivers/media/dvb-core/dvbdev.c:103
Read of size 8 at addr ffffffff8b942a80 by task syz.1.3101/16977

CPU: 1 PID: 16977 Comm: syz.1.3101 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 dvb_device_open+0xe8/0x370 drivers/media/dvb-core/dvbdev.c:103
 chrdev_open+0x5c5/0x6a0 fs/char_dev.c:414
 do_dentry_open+0x7e9/0x10d0 fs/open.c:882
 do_open fs/namei.c:3634 [inline]
 path_openat+0x2635/0x2ee0 fs/namei.c:3791
 do_filp_open+0x1f1/0x430 fs/namei.c:3818
 do_sys_openat2+0x150/0x4b0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f99ae75d68e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f99af5a1b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f99af5a26c0 RCX: 00007f99ae75d68e
RDX: 0000000000000002 RSI: 00007f99af5a1c00 RDI: ffffffffffffff9c
RBP: 00007f99af5a1c00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f99aea16038 R14: 00007f99aea15fa0 R15: 00007ffc588cd6e8
 </TASK>

The buggy address belongs to the variable:
 .str+0x0/0x20

The buggy address belongs to the physical page:
page:ffffea00002e5080 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xb942
flags: 0xfff00000001000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000001000 ffffea00002e5088 ffffea00002e5088 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff8b942980: 05 f9 f9 f9 00 00 00 01 f9 f9 f9 f9 00 00 00 00
 ffffffff8b942a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffffff8b942a80: 04 f9 f9 f9 05 f9 f9 f9 05 f9 f9 f9 00 00 02 f9
                   ^
 ffffffff8b942b00: f9 f9 f9 f9 07 f9 f9 f9 00 00 00 00 07 f9 f9 f9
 ffffffff8b942b80: 05 f9 f9 f9 05 f9 f9 f9 05 f9 f9 f9 00 00 00 00
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