netdev - Re: [PATCH net v2] sctp: fix memory leak in sctp_stream_outq

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Date:   Thu, 24 Nov 2022 14:18:11 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Zhengchao Shao <shaozhengchao@...wei.com>
Cc:     linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        vyasevich@...il.com, nhorman@...driver.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com, weiyongjun1@...wei.com,
        yuehaibing@...wei.com
Subject: Re: [PATCH net v2] sctp: fix memory leak in
 sctp_stream_outq_migrate()

On Thu, Nov 24, 2022 at 09:11:00PM +0800, Zhengchao Shao wrote:
> When sctp_stream_outq_migrate() is called to release stream out resources,
> the memory pointed to by prio_head in stream out is not released.
> 
> The memory leak information is as follows:
>  unreferenced object 0xffff88801fe79f80 (size 64):
>    comm "sctp_repo", pid 7957, jiffies 4294951704 (age 36.480s)
>    hex dump (first 32 bytes):
>      80 9f e7 1f 80 88 ff ff 80 9f e7 1f 80 88 ff ff  ................
>      90 9f e7 1f 80 88 ff ff 90 9f e7 1f 80 88 ff ff  ................
>    backtrace:
>      [<ffffffff81b215c6>] kmalloc_trace+0x26/0x60
>      [<ffffffff88ae517c>] sctp_sched_prio_set+0x4cc/0x770
>      [<ffffffff88ad64f2>] sctp_stream_init_ext+0xd2/0x1b0
>      [<ffffffff88aa2604>] sctp_sendmsg_to_asoc+0x1614/0x1a30
>      [<ffffffff88ab7ff1>] sctp_sendmsg+0xda1/0x1ef0
>      [<ffffffff87f765ed>] inet_sendmsg+0x9d/0xe0
>      [<ffffffff8754b5b3>] sock_sendmsg+0xd3/0x120
>      [<ffffffff8755446a>] __sys_sendto+0x23a/0x340
>      [<ffffffff87554651>] __x64_sys_sendto+0xe1/0x1b0
>      [<ffffffff89978b49>] do_syscall_64+0x39/0xb0
>      [<ffffffff89a0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> Link: https://syzkaller.appspot.com/bug?exrid=29c402e56c4760763cc0
> Fixes: Fixes: 637784ade221 ("sctp: introduce priority based stream scheduler")
> Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
> ---
> v2: add .free_sid hook function and use it to free a stream

It's missing the change to sctp_stream_free as well. Please lets try
to avoid having multiple paths freeing it differently as much as
possible.

Thanks.