linux-kernel - Re: [PATCH net] rxrpc: Fix wrong error return in rxrpc_connect

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Message-ID: <3e278fed9f59a4e325933d4a4ef4b02991fb2c17.camel@gmail.com>
Date:   Thu, 12 Jan 2023 08:57:09 -0800
From:   Alexander H Duyck <alexander.duyck@...il.com>
To:     David Howells <dhowells@...hat.com>, netdev@...r.kernel.org
Cc:     Marc Dionne <marc.dionne@...istor.com>,
        Dan Carpenter <error27@...il.com>,
        kernel test robot <lkp@...el.com>,
        syzbot+4bb6356bb29d6299360e@...kaller.appspotmail.com,
        linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] rxrpc: Fix wrong error return in
 rxrpc_connect_call()

On Wed, 2023-01-11 at 18:07 +0000, David Howells wrote:
>     
> Fix rxrpc_connect_call() to return -ENOMEM rather than 0 if it fails to
> look up a peer.
> 
> This generated a smatch warning:
>         net/rxrpc/call_object.c:303 rxrpc_connect_call() warn: missing error code 'ret'
> 
> I think this also fixes a syzbot-found bug:
> 
>         rxrpc: Assertion failed - 1(0x1) == 11(0xb) is false
>         ------------[ cut here ]------------
>         kernel BUG at net/rxrpc/call_object.c:645!
> 
> where the call being put is in the wrong state - as would be the case if we
> failed to clear up correctly after the error in rxrpc_connect_call().
> 
> Fixes: 9d35d880e0e4 ("rxrpc: Move client call connection to the I/O thread")
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <error27@...il.com>
> Reported-and-tested-by: syzbot+4bb6356bb29d6299360e@...kaller.appspotmail.com
> Signed-off-by: David Howells <dhowells@...hat.com>
> Link: https://lore.kernel.org/r/202301111153.9eZRYLf1-lkp@intel.com/
> ---
>  net/rxrpc/call_object.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
> index 3ded5a24627c..f3c9f0201c15 100644
> --- a/net/rxrpc/call_object.c
> +++ b/net/rxrpc/call_object.c
> @@ -294,7 +294,7 @@ static void rxrpc_put_call_slot(struct rxrpc_call *call)
>  static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp)
>  {
>  	struct rxrpc_local *local = call->local;
> -	int ret = 0;
> +	int ret = -ENOMEM;
>  
>  	_enter("{%d,%lx},", call->debug_id, call->user_call_ID);
>  

Looks good to me.

Reviewed-by: Alexander Duyck <alexanderduyck@...com>