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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:2260 [inline]
BUG: KASAN: slab-out-of-bounds in qrtr_endpoint_post+0x5c1/0x1050 net/qrtr/qrtr.c:492
Read of size 4294967294 at addr ffff8880a0c6f710 by task syz-executor.2/11807

CPU: 0 PID: 11807 Comm: syz-executor.2 Not tainted 5.8.0-rc7-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/0x436 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:2260 [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:1908 [inline]
 new_sync_write+0x422/0x650 fs/read_write.c:503
 vfs_write+0x59d/0x6b0 fs/read_write.c:578
 ksys_write+0x12d/0x250 fs/read_write.c:631
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cc79
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:00007fc7f09edc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000000382c0 RCX: 000000000045cc79
RDX: 0000000000000010 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007fff1e1f31df R14: 00007fc7f09ee9c0 R15: 000000000078bf0c

Allocated by task 11807:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc+0x17a/0x340 mm/slab.c:3665
 kmalloc include/linux/slab.h:560 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 qrtr_tun_write_iter+0x8a/0x180 net/qrtr/tun.c:83
 call_write_iter include/linux/fs.h:1908 [inline]
 new_sync_write+0x422/0x650 fs/read_write.c:503
 vfs_write+0x59d/0x6b0 fs/read_write.c:578
 ksys_write+0x12d/0x250 fs/read_write.c:631
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 11358:
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x103/0x2c0 mm/slab.c:3757
 kvfree+0x42/0x50 mm/util.c:603
 groups_free kernel/groups.c:36 [inline]
 __do_sys_setgroups+0x2be/0x3d0 kernel/groups.c:211
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880a0c6f700
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8880a0c6f700, ffff8880a0c6f720)
The buggy address belongs to the page:
page:ffffea0002831bc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880a0c6ffc1
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00029ed0c8 ffffea000256b288 ffff8880aa0001c0
raw: ffff8880a0c6ffc1 ffff8880a0c6f000 0000000100000032 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a0c6f600: fb fb fb fb fc fc fc fc 05 fc fc fc fc fc fc fc
 ffff8880a0c6f680: 04 fc fc fc fc fc fc fc 00 00 00 fc fc fc fc fc
>ffff8880a0c6f700: 00 00 fc fc fc fc fc fc 05 fc fc fc fc fc fc fc
                         ^
 ffff8880a0c6f780: 00 01 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a0c6f800: 00 00 00 02 fc fc fc fc 00 00 00 04 fc fc fc fc
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