On Thu, Jan 24, 2013 at 11:02:47AM -0500, Vlad Yasevich wrote:
> 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
>
> Reported-by: Martin Mokrejs <mmokrejs@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Vlad Yasevich <vyasevich@xxxxxxxxx>
> CC: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
> ---
> 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..cd5712f 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_hdr->ctl_table_arg;
> unregister_net_sysctl_table(net->sctp.sysctl_header);
> + kfree(table);
> }
>
> static struct ctl_table_header * sctp_sysctl_header;
> --
> 1.7.7.6
>
> --
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>
Acked-by: Neil Horman <nhorman@xxxxxxxxxxxxx>
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