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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:447 [inline]
BUG: KASAN: slab-out-of-bounds in skb_put_data include/linux/skbuff.h:2281 [inline]
BUG: KASAN: slab-out-of-bounds in qrtr_endpoint_post+0x5c0/0x11b0 net/qrtr/qrtr.c:499
Read of size 4294967293 at addr ffff8880126a8ae0 by task syz-executor.2/20263

CPU: 1 PID: 20263 Comm: syz-executor.2 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2c6 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 check_memory_region_inline mm/kasan/generic.c:179 [inline]
 check_memory_region+0x13d/0x180 mm/kasan/generic.c:185
 memcpy+0x20/0x60 mm/kasan/shadow.c:64
 memcpy include/linux/string.h:447 [inline]
 skb_put_data include/linux/skbuff.h:2281 [inline]
 qrtr_endpoint_post+0x5c0/0x11b0 net/qrtr/qrtr.c:499
 qrtr_tun_write_iter+0x10e/0x1b0 net/qrtr/tun.c:98
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:518
 vfs_write+0x791/0xa30 fs/read_write.c:605
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x465d99
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2e37212188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465d99
RDX: 0000000000000020 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00000000004bcf27 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffed9034a5f R14: 00007f2e37212300 R15: 0000000000022000

Allocated by task 20263:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:401 [inline]
 ____kasan_kmalloc.constprop.0+0x7f/0xa0 mm/kasan/common.c:429
 kasan_kmalloc include/linux/kasan.h:219 [inline]
 __do_kmalloc mm/slab.c:3659 [inline]
 __kmalloc+0x20c/0x440 mm/slab.c:3668
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:682 [inline]
 qrtr_tun_write_iter+0xc2/0x1b0 net/qrtr/tun.c:89
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:518
 vfs_write+0x791/0xa30 fs/read_write.c:605
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880126a8ac0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
 32-byte region [ffff8880126a8ac0, ffff8880126a8ae0)
The buggy address belongs to the page:
page:000000006040c41f refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880126a8fc1 pfn:0x126a8
flags: 0xfff00000000200(slab)
raw: 00fff00000000200 ffffea00005ff308 ffffea0000a943c8 ffff888010c40100
raw: ffff8880126a8fc1 ffff8880126a8000 0000000100000035 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880126a8980: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc
 ffff8880126a8a00: 00 04 fc fc fc fc fc fc fa fb fb fb fc fc fc fc
>ffff8880126a8a80: fa fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
                                                       ^
 ffff8880126a8b00: fa fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc
 ffff8880126a8b80: fa fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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