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BUG: KASAN: stack-out-of-bounds in bitmap_from_arr32+0x14b/0x1d0 lib/bitmap.c:1272
Write of size 8 at addr ffffc9000a1075a0 by task syz-executor.5/10891

CPU: 0 PID: 10891 Comm: syz-executor.5 Not tainted 5.6.0-rc3-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+0x96/0xe0 lib/dump_stack.c:118
 print_address_description.constprop.4.cold.6+0x62/0x373 mm/kasan/report.c:374
 __kasan_report.cold.7+0x7a/0x92 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:641
 bitmap_from_arr32+0x14b/0x1d0 lib/bitmap.c:1272
 ethnl_parse_bitset+0x3ea/0x680 net/ethtool/bitset.c:633
 ethnl_set_features+0x293/0x8e8 net/ethtool/features.c:252
 genl_family_rcv_msg_doit net/netlink/genetlink.c:673 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:718 [inline]
 genl_rcv_msg+0x5e7/0xf10 net/netlink/genetlink.c:735
 netlink_rcv_skb+0x119/0x340 net/netlink/af_netlink.c:2478
 genl_rcv+0x1f/0x30 net/netlink/genetlink.c:746
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x434/0x630 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x761/0xc90 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xac/0xf0 net/socket.c:672
 ____sys_sendmsg+0x54e/0x760 net/socket.c:2343
 ___sys_sendmsg+0xe4/0x160 net/socket.c:2397
 __sys_sendmsg+0xce/0x170 net/socket.c:2430
 do_syscall_64+0x8e/0x4f0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45deb9
Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbc90d73c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000000291c0 RCX: 000000000045deb9
RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000000000003
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007fff8001026f R14: 00007fbc90d749c0 R15: 000000000118bf2c


addr ffffc9000a1075a0 is located in stack of task syz-executor.5/10891 at offset 360 in frame:
 ethnl_set_features+0x0/0x8e8 net/ethtool/features.c:51

this frame has 8 objects:
 [32, 40) 'reply_payload'
 [96, 112) 'req_info'
 [160, 168) 'wanted_diff_mask'
 [224, 232) 'active_diff_mask'
 [288, 296) 'new_active'
 [352, 360) 'req_wanted'
 [416, 424) 'req_mask'
 [480, 528) 'tb'

Memory state around the buggy address:
 ffffc9000a107480: f2 f2 f2 00 00 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2
 ffffc9000a107500: f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2
>ffffc9000a107580: f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2
                               ^
 ffffc9000a107600: f2 f2 f2 00 00 00 00 00 00 f2 f2 00 00 00 00 00
 ffffc9000a107680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1
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