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Subject[PATCH 4.19 093/113] net: dsa: Fix error cleanup path in dsa_init_module
Date
From: YueHaibing <yuehaibing@huawei.com>

[ Upstream commit 68be930249d051fd54d3d99156b3dcadcb2a1f9b ]

BUG: unable to handle kernel paging request at ffffffffa01c5430
PGD 3270067 P4D 3270067 PUD 3271063 PMD 230bc5067 PTE 0
Oops: 0000 [#1
CPU: 0 PID: 6159 Comm: modprobe Not tainted 5.1.0+ #33
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org 04/01/2014
RIP: 0010:raw_notifier_chain_register+0x16/0x40
Code: 63 f8 66 90 e9 5d ff ff ff 90 90 90 90 90 90 90 90 90 90 90 55 48 8b 07 48 89 e5 48 85 c0 74 1c 8b 56 10 3b 50 10 7e 07 eb 12 <39> 50 10 7c 0d 48 8d 78 08 48 8b 40 08 48 85 c0 75 ee 48 89 46 08
RSP: 0018:ffffc90001c33c08 EFLAGS: 00010282
RAX: ffffffffa01c5420 RBX: ffffffffa01db420 RCX: 4fcef45928070a8b
RDX: 0000000000000000 RSI: ffffffffa01db420 RDI: ffffffffa01b0068
RBP: ffffc90001c33c08 R08: 000000003e0a33d0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000094443661 R12: ffff88822c320700
R13: ffff88823109be80 R14: 0000000000000000 R15: ffffc90001c33e78
FS: 00007fab8bd08540(0000) GS:ffff888237a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffa01c5430 CR3: 00000002297ea000 CR4: 00000000000006f0
Call Trace:
register_netdevice_notifier+0x43/0x250
? 0xffffffffa01e0000
dsa_slave_register_notifier+0x13/0x70 [dsa_core
? 0xffffffffa01e0000
dsa_init_module+0x2e/0x1000 [dsa_core
do_one_initcall+0x6c/0x3cc
? do_init_module+0x22/0x1f1
? rcu_read_lock_sched_held+0x97/0xb0
? kmem_cache_alloc_trace+0x325/0x3b0
do_init_module+0x5b/0x1f1
load_module+0x1db1/0x2690
? m_show+0x1d0/0x1d0
__do_sys_finit_module+0xc5/0xd0
__x64_sys_finit_module+0x15/0x20
do_syscall_64+0x6b/0x1d0
entry_SYSCALL_64_after_hwframe+0x49/0xbe

Cleanup allocated resourses if there are errors,
otherwise it will trgger memleak.

Fixes: c9eb3e0f8701 ("net: dsa: Add support for learning FDB through notification")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/dsa/dsa.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -293,15 +293,22 @@ static int __init dsa_init_module(void)

rc = dsa_slave_register_notifier();
if (rc)
- return rc;
+ goto register_notifier_fail;

rc = dsa_legacy_register();
if (rc)
- return rc;
+ goto legacy_register_fail;

dev_add_pack(&dsa_pack_type);

return 0;
+
+legacy_register_fail:
+ dsa_slave_unregister_notifier();
+register_notifier_fail:
+ destroy_workqueue(dsa_owq);
+
+ return rc;
}
module_init(dsa_init_module);


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