netdev - Re: [PATCH net v2] mptcp: fix memory leak in mptcp_subflow_create

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Date:   Mon, 15 Jun 2020 18:09:41 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     weiyongjun1@...wei.com
Cc:     mathew.j.martineau@...ux.intel.com, matthieu.baerts@...sares.net,
        peter.krystad@...ux.intel.com, netdev@...r.kernel.org,
        mptcp@...ts.01.org
Subject: Re: [PATCH net v2] mptcp: fix memory leak in
 mptcp_subflow_create_socket()

From: Wei Yongjun <weiyongjun1@...wei.com>
Date: Mon, 15 Jun 2020 09:35:22 +0800

> socket malloced  by sock_create_kern() should be release before return
> in the error handling, otherwise it cause memory leak.
> 
> unreferenced object 0xffff88810910c000 (size 1216):
>   comm "00000003_test_m", pid 12238, jiffies 4295050289 (age 54.237s)
>   hex dump (first 32 bytes):
>     01 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 2f 30 0a 81 88 ff ff  ........./0.....
>   backtrace:
>     [<00000000e877f89f>] sock_alloc_inode+0x18/0x1c0
>     [<0000000093d1dd51>] alloc_inode+0x63/0x1d0
>     [<000000005673fec6>] new_inode_pseudo+0x14/0xe0
>     [<00000000b5db6be8>] sock_alloc+0x3c/0x260
>     [<00000000e7e3cbb2>] __sock_create+0x89/0x620
>     [<0000000023e48593>] mptcp_subflow_create_socket+0xc0/0x5e0
>     [<00000000419795e4>] __mptcp_socket_create+0x1ad/0x3f0
>     [<00000000b2f942e8>] mptcp_stream_connect+0x281/0x4f0
>     [<00000000c80cd5cc>] __sys_connect_file+0x14d/0x190
>     [<00000000dc761f11>] __sys_connect+0x128/0x160
>     [<000000008b14e764>] __x64_sys_connect+0x6f/0xb0
>     [<000000007b4f93bd>] do_syscall_64+0xa1/0x530
>     [<00000000d3e770b6>] entry_SYSCALL_64_after_hwframe+0x49/0xb3
> 
> Fixes: 2303f994b3e1 ("mptcp: Associate MPTCP context with TCP socket")
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> ---
> v1 -> v2: add net prefix to subject line

Applied and queued up for v5.6 -stable, thanks.