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SubjectUBSAN: shift-out-of-bounds in nl802154_new_interface

syzbot found the following issue on:

HEAD commit: 3af409ca net: enetc: fix destroyed phylink dereference dur..
git tree: net
console output:
kernel config:
dashboard link:
syz repro:
C reproducer:

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:
final oops:
console output:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

UBSAN: shift-out-of-bounds in net/ieee802154/nl802154.c:914:44
shift exponent -1627389953 is negative
CPU: 0 PID: 8454 Comm: syz-executor539 Not tainted 5.11.0-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:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
ubsan_epilogue+0xb/0x5a lib/ubsan.c:148
__ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395
nl802154_new_interface.cold+0x19/0x1e net/ieee802154/nl802154.c:914
genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494
genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e8/0x810 net/socket.c:2345
___sys_sendmsg+0xf3/0x170 net/socket.c:2399
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2432
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
RIP: 0033:0x43fa19
Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffda15b8b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 000000000043fa19
RDX: 0000000000000000 RSI: 0000000020000ac0 RDI: 0000000000000003
RBP: 0000000000403480 R08: 0000000000000001 R09: 00000000004004a0
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000403510
R13: 0000000000000000 R14: 00000000004ad018 R15: 00000000004004a0

This report is generated by a bot. It may contain errors.
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For information about bisection process see:
syzbot can test patches for this issue, for details see:

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