BUG: KASAN: use-after-free in p54u_load_firmware_cb.cold+0x97/0x13d drivers/net/wireless/intersil/p54/p54usb.c:933
Read of size 8 at addr ffff8881c7f8b568 by task kworker/1:3/2777

CPU: 1 PID: 2777 Comm: kworker/1:3 Not tainted 5.2.0-rc6+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events request_firmware_work_func
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xca/0x13e lib/dump_stack.c:113
 print_address_description+0x67/0x231 mm/kasan/report.c:188
 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:317
 kasan_report+0xe/0x20 mm/kasan/common.c:614
 p54u_load_firmware_cb.cold+0x97/0x13d drivers/net/wireless/intersil/p54/p54usb.c:933
 request_firmware_work_func+0x126/0x242 drivers/base/firmware_loader/main.c:785
 process_one_work+0x905/0x1570 kernel/workqueue.c:2269
 worker_thread+0x96/0xe20 kernel/workqueue.c:2415
 kthread+0x30b/0x410 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 1738:
 save_stack+0x1b/0x80 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc mm/kasan/common.c:489 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:462
 slab_post_alloc_hook mm/slab.h:437 [inline]
 slab_alloc_node mm/slub.c:2748 [inline]
 __kmalloc_node_track_caller+0xee/0x370 mm/slub.c:4363
 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:138
 __alloc_skb+0xef/0x5a0 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:1054 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1179 [inline]
 netlink_sendmsg+0x8d6/0xcc0 net/netlink/af_netlink.c:1897
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:665
 ___sys_sendmsg+0x803/0x920 net/socket.c:2286
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2324
 do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 1738:
 save_stack+0x1b/0x80 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:451
 slab_free_hook mm/slub.c:1421 [inline]
 slab_free_freelist_hook mm/slub.c:1448 [inline]
 slab_free mm/slub.c:2994 [inline]
 kfree+0xd7/0x280 mm/slub.c:3949
 skb_free_head+0x8b/0xa0 net/core/skbuff.c:588
 skb_release_data+0x41f/0x7c0 net/core/skbuff.c:608
 skb_release_all+0x46/0x60 net/core/skbuff.c:662
 __kfree_skb net/core/skbuff.c:676 [inline]
 consume_skb net/core/skbuff.c:736 [inline]
 consume_skb+0xc0/0x2f0 net/core/skbuff.c:730
 netlink_unicast_kernel net/netlink/af_netlink.c:1308 [inline]
 netlink_unicast+0x4d7/0x690 net/netlink/af_netlink.c:1333
 netlink_sendmsg+0x80b/0xcc0 net/netlink/af_netlink.c:1922
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:665
 ___sys_sendmsg+0x803/0x920 net/socket.c:2286
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2324
 do_syscall_64+0xb7/0x560 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881c7f8b180
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 1000 bytes inside of
 1024-byte region [ffff8881c7f8b180, ffff8881c7f8b580)
The buggy address belongs to the page:
page:ffffea00071fe200 refcount:1 mapcount:0 mapping:ffff8881dac02a00 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000200 ffff8881dac02a00
raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881c7f8b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881c7f8b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881c7f8b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                          ^
 ffff8881c7f8b580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881c7f8b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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