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Subject[PATCH] Free skb at error context in auditd_send_unicast_skb().
Date
I got following memory leak reports by kmemleak.

unreferenced object 0xffff965962fa0600 (size 256):
comm "auditd", pid 401, jiffies 4294671604 (age 62.331s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffffb8859baa>] kmemleak_alloc+0x4a/0xa0
[<ffffffffb8238a96>] kmem_cache_alloc_node+0x146/0x1f0
[<ffffffffb870e52b>] __alloc_skb+0x5b/0x1e0
[<ffffffffb814fc5c>] audit_make_reply+0x5c/0xd0
[<ffffffffb815160a>] audit_receive_msg+0xa1a/0xe60
[<ffffffffb8151aa3>] audit_receive+0x53/0xa0
[<ffffffffb875e95b>] netlink_unicast+0x18b/0x220
[<ffffffffb875ecb5>] netlink_sendmsg+0x2c5/0x3c0
[<ffffffffb8705008>] sock_sendmsg+0x38/0x50
[<ffffffffb870558f>] SYSC_sendto+0x13f/0x180
[<ffffffffb870608e>] SyS_sendto+0xe/0x10
[<ffffffffb8003a57>] do_syscall_64+0x67/0x140
[<ffffffffb8865ca7>] return_from_SYSCALL_64+0x0/0x6a
[<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff96595a9da600 (size 512):
comm "auditd", pid 401, jiffies 4294671604 (age 62.331s)
hex dump (first 32 bytes):
14 00 00 00 31 05 00 00 00 00 00 00 00 00 00 00 ....1...........
91 01 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffffb8859baa>] kmemleak_alloc+0x4a/0xa0
[<ffffffffb823c8a3>] __kmalloc_node_track_caller+0x233/0x2f0
[<ffffffffb870d9d1>] __kmalloc_reserve.isra.38+0x31/0x90
[<ffffffffb870e557>] __alloc_skb+0x87/0x1e0
[<ffffffffb814fc5c>] audit_make_reply+0x5c/0xd0
[<ffffffffb815160a>] audit_receive_msg+0xa1a/0xe60
[<ffffffffb8151aa3>] audit_receive+0x53/0xa0
[<ffffffffb875e95b>] netlink_unicast+0x18b/0x220
[<ffffffffb875ecb5>] netlink_sendmsg+0x2c5/0x3c0
[<ffffffffb8705008>] sock_sendmsg+0x38/0x50
[<ffffffffb870558f>] SYSC_sendto+0x13f/0x180
[<ffffffffb870608e>] SyS_sendto+0xe/0x10
[<ffffffffb8003a57>] do_syscall_64+0x67/0x140
[<ffffffffb8865ca7>] return_from_SYSCALL_64+0x0/0x6a
[<ffffffffffffffff>] 0xffffffffffffffff

These skb objects have been allocated in audit_replace().
If some error happened in auditd_send_unicast_skb(), skb is needed
to be freed.

Signed-off-by: Masami Ichikawa <masami256@gmail.com>
---
kernel/audit.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/kernel/audit.c b/kernel/audit.c
index 833267bbd80b..789f4cc1f481 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -659,6 +659,7 @@ static int auditd_send_unicast_skb(struct sk_buff *skb)
err:
if (ac && rc == -ECONNREFUSED)
auditd_reset(ac);
+ kfree_skb(skb);
return rc;
}

--
2.13.0
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