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From: David Howells <dhowells@redhat.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: dhowells@redhat.com, Igor Konopko <igor.j.konopko@intel.com>,
	"Mohit P . Tahiliani" <tahiliani@nitk.edu.in>,
	Takashi Sakamoto <o-takashi@sakamocchi.jp>,
	Eran Ben Elisha <eranbe@mellanox.com>,
	Matias Bjorling <mb@lightnvm.io>, Jiri Pirko <jiri@mellanox.com>,
	"David S . Miller" <davem@davemloft.net>,
	Jamal Hadi Salim <jhs@mojatatu.com>,
	Cong Wang <xiyou.wangcong@gmail.com>,
	Clemens Ladisch <clemens@ladisch.de>,
	Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
	Joe Perches <joe@perches.com>, Arnd Bergmann <arnd@arndb.de>,
	Dan Carpenter <dan.carpenter@oracle.com>,
	linux-block@vger.kernel.org, netdev@vger.kernel.org,
	linux-afs@lists.infradead.org, alsa-devel@alsa-project.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/5] rxrpc: Fix uninitialized error code in rxrpc_send_data_packet()
Date: Tue, 28 May 2019 17:30:19 +0100	[thread overview]
Message-ID: <4654.1559061019@warthog.procyon.org.uk> (raw)
In-Reply-To: <20190528142424.19626-3-geert@linux-m68k.org>

Geert Uytterhoeven <geert@linux-m68k.org> wrote:

> While this is not a real false-positive, I believe it cannot cause harm
> in practice, as AF_RXRPC cannot be used with other transport families
> than IPv4 and IPv6.

Agreed.

> ---
>  net/rxrpc/output.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
> index 004c762c2e8d063c..1473d774d67100c5 100644
> --- a/net/rxrpc/output.c
> +++ b/net/rxrpc/output.c
> @@ -403,8 +403,10 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
>  
>  	/* send the packet with the don't fragment bit set if we currently
>  	 * think it's small enough */
> -	if (iov[1].iov_len >= call->peer->maxdata)
> +	if (iov[1].iov_len >= call->peer->maxdata) {
> +		ret = 0;
>  		goto send_fragmentable;
> +	}
>  
>  	down_read(&conn->params.local->defrag_sem);
>  

Simply setting 0 is wrong.  That would give the impression that the thing
worked if support for a new transport address family was added and came
through this function without full modification (say AF_INET7 becomes a
thing).

A better way to do things would be to add a default case into the
send_fragmentable switch statement that either BUG's or sets -EAFNOSUPPORT.

David

  parent reply	other threads:[~2019-05-28 16:30 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-28 14:24 [PATCH 0/5] Assorted fixes discovered with gcc 4.1 Geert Uytterhoeven
2019-05-28 14:24 ` [PATCH 1/5] lightnvm: Fix uninitialized pointer in nvm_remove_tgt() Geert Uytterhoeven
2019-05-29  8:08   ` Matias Bjørling
2019-05-29  8:12     ` Geert Uytterhoeven
2019-05-28 14:24 ` [PATCH 2/5] rxrpc: Fix uninitialized error code in rxrpc_send_data_packet() Geert Uytterhoeven
2019-05-29 11:49   ` Arnd Bergmann
2019-05-28 14:24 ` [PATCH 3/5] net: sched: pie: Use ULL suffix for 64-bit constant Geert Uytterhoeven
2019-05-29 11:39   ` Arnd Bergmann
2019-05-28 14:24 ` [PATCH 4/5] ALSA: fireface: Use ULL suffixes for 64-bit constants Geert Uytterhoeven
2019-05-29  9:57   ` Takashi Sakamoto
2019-05-29 10:07     ` Takashi Iwai
2019-05-28 14:24 ` [PATCH 5/5] [RFC] devlink: Fix uninitialized error code in devlink_fmsg_prepare_skb() Geert Uytterhoeven
2019-05-28 14:40   ` Eran Ben Elisha
2019-05-29  8:04   ` Jiri Pirko
2019-05-28 16:30 ` David Howells [this message]
2019-05-31 10:34 ` [PATCH] rxrpc: Fix uninitialized error code in rxrpc_send_data_packet() David Howells
2019-06-03 21:30   ` David Miller
2019-06-04  7:17   ` Geert Uytterhoeven
2019-06-04  7:34   ` David Howells
2019-06-04  7:35     ` Geert Uytterhoeven

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