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BUG: KASAN: use-after-free in hidraw_ioctl+0x609/0xae0 drivers/hid/hidraw.c:380
Read of size 4 at addr ffff8881ce6e4018 by task syz-executor236/2713

CPU: 0 PID: 2713 Comm: syz-executor236 Not tainted 5.3.0-rc2+ #25
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+0xca/0x13e lib/dump_stack.c:113
 print_address_description+0x6a/0x32c mm/kasan/report.c:351
 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
 kasan_report+0xe/0x12 mm/kasan/common.c:612
 hidraw_ioctl+0x609/0xae0 drivers/hid/hidraw.c:380
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446839
Code: e8 0c e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 8b cd fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffe798e8e78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000446839
RDX: 0000000000000000 RSI: 0000000080044801 RDI: 0000000000000004
RBP: 000000000000d6da R08: 000000000000000b R09: 0000000400000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000403ae0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 1604:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:487 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
 kmalloc include/linux/slab.h:552 [inline]
 syslog_print kernel/printk/printk.c:1346 [inline]
 do_syslog kernel/printk/printk.c:1519 [inline]
 do_syslog+0x540/0x1380 kernel/printk/printk.c:1493
 kmsg_read+0x8a/0xb0 fs/proc/kmsg.c:40
 proc_reg_read+0x1c1/0x280 fs/proc/inode.c:223
 __vfs_read+0x76/0x100 fs/read_write.c:425
 vfs_read+0x1ea/0x430 fs/read_write.c:461
 ksys_read+0x127/0x250 fs/read_write.c:587
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 1604:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
 slab_free_hook mm/slub.c:1423 [inline]
 slab_free_freelist_hook mm/slub.c:1470 [inline]
 slab_free mm/slub.c:3012 [inline]
 kfree+0xe4/0x2f0 mm/slub.c:3953
 syslog_print kernel/printk/printk.c:1405 [inline]
 do_syslog kernel/printk/printk.c:1519 [inline]
 do_syslog+0x1098/0x1380 kernel/printk/printk.c:1493
 kmsg_read+0x8a/0xb0 fs/proc/kmsg.c:40
 proc_reg_read+0x1c1/0x280 fs/proc/inode.c:223
 __vfs_read+0x76/0x100 fs/read_write.c:425
 vfs_read+0x1ea/0x430 fs/read_write.c:461
 ksys_read+0x127/0x250 fs/read_write.c:587
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881ce6e4000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 24 bytes inside of
 1024-byte region [ffff8881ce6e4000, ffff8881ce6e4400)
The buggy address belongs to the page:
page:ffffea000739b900 refcount:1 mapcount:0 mapping:ffff8881da002280 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da002280
raw: 0000000000000000 00000000800e000e 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881ce6e3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881ce6e3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881ce6e4000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff8881ce6e4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881ce6e4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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