[syzbot] [kernel?] KFENCE: memory corruption in add_sysfs_param

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    c02d24a5af66 Add linux-next specific files for 20241003
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=10ac0d80580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=94f9caf16c0af42d
dashboard link: https://syzkaller.appspot.com/bug?extid=873cb3989e92ad5d796d
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/641e642c9432/disk-c02d24a5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/98aaf20c29e0/vmlinux-c02d24a5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c23099f2d86b/bzImage-c02d24a5.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+873cb3989e92ad5d796d@xxxxxxxxxxxxxxxxxxxxxxxxx

can: broadcast manager protocol
can: netlink gateway - max_hops=1
can: SAE J1939
can: isotp protocol (max_pdu_size 8300)
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM ver 1.11
Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Bluetooth: BNEP filters: protocol multicast
Bluetooth: BNEP socket layer initialized
Bluetooth: HIDP (Human Interface Emulation) ver 1.2
Bluetooth: HIDP socket layer initialized
NET: Registered PF_RXRPC protocol family
Key type rxrpc registered
Key type rxrpc_s registered
NET: Registered PF_KCM protocol family
lec:lane_module_init: lec.c: initialized
mpoa:atm_mpoa_init: mpc.c: initialized
l2tp_core: L2TP core driver, V2.0
l2tp_ppp: PPPoL2TP kernel driver, V2.0
l2tp_ip: L2TP IP encapsulation support (L2TPv3)
l2tp_netlink: L2TP netlink interface
l2tp_eth: L2TP ethernet pseudowire support (L2TPv3)
l2tp_ip6: L2TP IP encapsulation support for IPv6 (L2TPv3)
NET: Registered PF_PHONET protocol family
8021q: 802.1Q VLAN Support v1.8
DCCP: Activated CCID 2 (TCP-like)
DCCP: Activated CCID 3 (TCP-Friendly Rate Control)
DCCP is deprecated and scheduled to be removed in 2025, please contact the netdev mailing list
sctp: Hash tables configured (bind 32/56)
NET: Registered PF_RDS protocol family
Registered RDS/infiniband transport
Registered RDS/tcp transport
tipc: Activated (version 2.0.0)
NET: Registered PF_TIPC protocol family
tipc: Started in single node mode
NET: Registered PF_SMC protocol family
9pnet: Installing 9P2000 support
NET: Registered PF_CAIF protocol family
NET: Registered PF_IEEE802154 protocol family
Key type dns_resolver registered
Key type ceph registered
libceph: loaded (mon/osd proto 15/24)
batman_adv: B.A.T.M.A.N. advanced 2024.2 (compatibility version 15) loaded
openvswitch: Open vSwitch switching datapath
NET: Registered PF_VSOCK protocol family
mpls_gso: MPLS GSO support
IPI shorthand broadcast: enabled
AES CTR mode by8 optimization enabled
==================================================================
BUG: KFENCE: memory corruption in krealloc_noprof+0x160/0x2e0

Corrupted memory at 0xffff88823be6c088 [ 0x08 0x46 0x11 0x30 0x80 0x88 0xff 0xff 0x60 0x46 0x11 0x30 0x80 0x88 0xff 0xff ] (in kfence-#53):
 krealloc_noprof+0x160/0x2e0
 add_sysfs_param+0x137/0x7f0 kernel/params.c:663
 kernel_add_sysfs_param+0xb4/0x130 kernel/params.c:817
 param_sysfs_builtin+0x16e/0x1f0 kernel/params.c:856
 param_sysfs_builtin_init+0x31/0x40 kernel/params.c:990
 do_one_initcall+0x248/0x880 init/main.c:1266
 do_initcall_level+0x157/0x210 init/main.c:1328
 do_initcalls+0x3f/0x80 init/main.c:1344
 kernel_init_freeable+0x435/0x5d0 init/main.c:1577
 kernel_init+0x1d/0x2b0 init/main.c:1466
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

kfence-#53: 0xffff88823be6c000-0xffff88823be6c087, size=136, cache=kmalloc-192

allocated by task 1 on cpu 1 at 10.052565s (0.009153s ago):
 __do_krealloc mm/slub.c:4784 [inline]
 krealloc_noprof+0xd6/0x2e0 mm/slub.c:4838
 add_sysfs_param+0x137/0x7f0 kernel/params.c:663
 kernel_add_sysfs_param+0xb4/0x130 kernel/params.c:817
 param_sysfs_builtin+0x16e/0x1f0 kernel/params.c:856
 param_sysfs_builtin_init+0x31/0x40 kernel/params.c:990
 do_one_initcall+0x248/0x880 init/main.c:1266
 do_initcall_level+0x157/0x210 init/main.c:1328
 do_initcalls+0x3f/0x80 init/main.c:1344
 kernel_init_freeable+0x435/0x5d0 init/main.c:1577
 kernel_init+0x1d/0x2b0 init/main.c:1466
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

freed by task 1 on cpu 1 at 10.059120s (0.002598s ago):
 krealloc_noprof+0x160/0x2e0
 add_sysfs_param+0x137/0x7f0 kernel/params.c:663
 kernel_add_sysfs_param+0xb4/0x130 kernel/params.c:817
 param_sysfs_builtin+0x16e/0x1f0 kernel/params.c:856
 param_sysfs_builtin_init+0x31/0x40 kernel/params.c:990
 do_one_initcall+0x248/0x880 init/main.c:1266
 do_initcall_level+0x157/0x210 init/main.c:1328
 do_initcalls+0x3f/0x80 init/main.c:1344
 kernel_init_freeable+0x435/0x5d0 init/main.c:1577
 kernel_init+0x1d/0x2b0 init/main.c:1466
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.0-rc1-next-20241003-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================


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