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BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:406 [inline]
BUG: KASAN: slab-out-of-bounds in skb_put_data include/linux/skbuff.h:2266 [inline]
BUG: KASAN: slab-out-of-bounds in qrtr_endpoint_post+0x5c1/0x1050 net/qrtr/qrtr.c:492
Read of size 4294967294 at addr ffff8880a47c7150 by task syz-executor.1/10921

CPU: 1 PID: 10921 Comm: syz-executor.1 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:186 [inline]
 check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
 memcpy+0x20/0x60 mm/kasan/common.c:105
 memcpy include/linux/string.h:406 [inline]
 skb_put_data include/linux/skbuff.h:2266 [inline]
 qrtr_endpoint_post+0x5c1/0x1050 net/qrtr/qrtr.c:492
 qrtr_tun_write_iter+0xf5/0x180 net/qrtr/tun.c:92
 call_write_iter include/linux/fs.h:1872 [inline]
 new_sync_write+0x422/0x650 fs/read_write.c:503
 vfs_write+0x5ad/0x730 fs/read_write.c:578
 ksys_write+0x12d/0x250 fs/read_write.c:631
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ce69
Code: 2d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5777520c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000038380 RCX: 000000000045ce69
RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffeb04325af R14: 00007f57775219c0 R15: 000000000118bf2c

Allocated by task 10921:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x1a8/0x320 mm/slab.c:3664
 kmalloc include/linux/slab.h:559 [inline]
 kzalloc include/linux/slab.h:666 [inline]
 qrtr_tun_write_iter+0x8a/0x180 net/qrtr/tun.c:83
 call_write_iter include/linux/fs.h:1872 [inline]
 new_sync_write+0x422/0x650 fs/read_write.c:503
 vfs_write+0x5ad/0x730 fs/read_write.c:578
 ksys_write+0x12d/0x250 fs/read_write.c:631
 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 ffff8880a47c7140
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8880a47c7140, ffff8880a47c7160)
The buggy address belongs to the page:
page:00000000c5e213bf refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a47c7fc1 pfn:0xa47c7
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002681248 ffffea00029b2608 ffff8880aa040100
raw: ffff8880a47c7fc1 ffff8880a47c7000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a47c7000: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
 ffff8880a47c7080: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
>ffff8880a47c7100: fa fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
                                                 ^
 ffff8880a47c7180: 00 05 fc fc fc fc fc fc fa fb fb fb fc fc fc fc
 ffff8880a47c7200: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
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