From: ebiederm@xmission•com (Eric W. Biederman)
To: David Miller <davem@davemloft•net>
Cc: vyasevich@gmail•com, netdev@vger•kernel.org,
linux-sctp@vger•kernel.org, mmokrejs@fold•natur.cuni.cz
Subject: [PATCH] SCTP: Free the per-net sysctl table on net exit. v2
Date: Sun, 27 Jan 2013 19:25:11 -0800 [thread overview]
Message-ID: <87obgayoo8.fsf_-_@xmission.com> (raw)
In-Reply-To: <87libe3w69.fsf@xmission.com> (Eric W. Biederman's message of "Sun, 27 Jan 2013 17:58:54 -0800")
From: Vlad Yasevich <vyasevich@gmail•com>
Date: Thu, 24 Jan 2013 11:02:47 -0500
Per-net sysctl table needs to be explicitly freed at
net exit. Otherwise we see the following with kmemleak:
unreferenced object 0xffff880402d08000 (size 2048):
comm "chrome_sandbox", pid 18437, jiffies 4310887172 (age 9097.630s)
hex dump (first 32 bytes):
b2 68 89 81 ff ff ff ff 20 04 04 f8 01 88 ff ff .h...... .......
04 00 00 00 a4 01 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff815b4aad>] kmemleak_alloc+0x21/0x3e
[<ffffffff81110352>] slab_post_alloc_hook+0x28/0x2a
[<ffffffff81113fad>] __kmalloc_track_caller+0xf1/0x104
[<ffffffff810f10c2>] kmemdup+0x1b/0x30
[<ffffffff81571e9f>] sctp_sysctl_net_register+0x1f/0x72
[<ffffffff8155d305>] sctp_net_init+0x100/0x39f
[<ffffffff814ad53c>] ops_init+0xc6/0xf5
[<ffffffff814ad5b7>] setup_net+0x4c/0xd0
[<ffffffff814ada5e>] copy_net_ns+0x6d/0xd6
[<ffffffff810938b1>] create_new_namespaces+0xd7/0x147
[<ffffffff810939f4>] copy_namespaces+0x63/0x99
[<ffffffff81076733>] copy_process+0xa65/0x1233
[<ffffffff81077030>] do_fork+0x10b/0x271
[<ffffffff8100a0e9>] sys_clone+0x23/0x25
[<ffffffff815dda73>] stub_clone+0x13/0x20
[<ffffffffffffffff>] 0xffffffffffffffff
I fixed the spelling of sysctl_header so the code actually
compiles. -- EWB.
Reported-by: Martin Mokrejs <mmokrejs@fold•natur.cuni.cz>
Signed-off-by: Vlad Yasevich <vyasevich@gmail•com>
Acked-by: Neil Horman <nhorman@tuxdriver•com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission•com>
---
The typo is fixed in the patch this time in addition to my test
tree.
net/sctp/sysctl.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index 043889a..bf3c6e8 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -366,7 +366,11 @@ int sctp_sysctl_net_register(struct net *net)
void sctp_sysctl_net_unregister(struct net *net)
{
+ struct ctl_table *table;
+
+ table = net->sctp.sysctl_header->ctl_table_arg;
unregister_net_sysctl_table(net->sctp.sysctl_header);
+ kfree(table);
}
static struct ctl_table_header * sctp_sysctl_header;
--
1.7.5.4
next prev parent reply other threads:[~2013-01-28 3:25 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <51004F2D.9000405@fold.natur.cuni.cz>
2013-01-24 16:02 ` [PATCH] SCTP: Free the per-net sysctl table on net exit Vlad Yasevich
2013-01-24 16:44 ` Neil Horman
2013-01-24 22:14 ` Eric W. Biederman
2013-01-28 0:35 ` David Miller
2013-01-28 1:58 ` Eric W. Biederman
2013-01-28 3:25 ` Eric W. Biederman [this message]
2013-01-28 5:11 ` [PATCH] SCTP: Free the per-net sysctl table on net exit. v2 David Miller
2013-01-28 8:33 ` Martin Mokrejs
2013-01-28 15:47 ` Eric W. Biederman
2013-01-28 21:17 ` Martin Mokrejs
2013-01-28 21:25 ` Martin Mokrejs
2013-01-29 0:20 ` Eric W. Biederman
2013-03-05 9:05 ` Martin Mokrejs
2013-03-05 19:32 ` David Miller
2013-03-05 21:04 ` Martin Mokrejs
2013-03-05 21:08 ` David Miller
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