From: Geert Uytterhoeven <geert@linux-m68k.org>
To: David Howells <dhowells@redhat.com>
Cc: 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 <netdev@vger.kernel.org>,
linux-afs@lists.infradead.org,
ALSA Development Mailing List <alsa-devel@alsa-project.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] rxrpc: Fix uninitialized error code in rxrpc_send_data_packet()
Date: Tue, 4 Jun 2019 09:17:23 +0200 [thread overview]
Message-ID: <CAMuHMdX57DKCMpLXdtZPE-w0esUNVv9-SwYjmT5=m+u9ryAiHQ@mail.gmail.com> (raw)
In-Reply-To: <15499.1559298884@warthog.procyon.org.uk>
Hi David,
On Fri, May 31, 2019 at 12:35 PM David Howells <dhowells@redhat.com> wrote:
> Here's my take on the patch.
>
> David
> ---
> rxrpc: Fix uninitialized error code in rxrpc_send_data_packet()
>
> With gcc 4.1:
>
> net/rxrpc/output.c: In function ‘rxrpc_send_data_packet’:
> net/rxrpc/output.c:338: warning: ‘ret’ may be used uninitialized in this function
>
> Indeed, if the first jump to the send_fragmentable label is made, and
> the address family is not handled in the switch() statement, ret will be
> used uninitialized.
>
> Fix this by BUG()'ing as is done in other places in rxrpc where internal
> support for future address families will need adding. It should not be
> possible to reach this normally as the address families are checked
> up-front.
>
> Fixes: 5a924b8951f835b5 ("rxrpc: Don't store the rxrpc header in the Tx queue sk_buffs")
> Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Signed-off-by: David Howells <dhowells@redhat.com>
I'm not such a big fan of BUG(), so I'd go for ret = -EAFNOSUPPORT, but given
rxrpc is already full of BUG() calls, I guess it is an acceptable solution.
> ---
> diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
> index 004c762c2e8d..6f2b4fb4b0aa 100644
> --- a/net/rxrpc/output.c
> +++ b/net/rxrpc/output.c
> @@ -523,6 +523,9 @@ int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb,
> }
> break;
> #endif
> +
> + default:
> + BUG();
> }
>
> if (ret < 0)
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2019-06-04 7:17 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 ` [PATCH 2/5] rxrpc: Fix uninitialized error code in rxrpc_send_data_packet() David Howells
2019-05-31 10:34 ` [PATCH] " David Howells
2019-06-03 21:30 ` David Miller
2019-06-04 7:17 ` Geert Uytterhoeven [this message]
2019-06-04 7:34 ` David Howells
2019-06-04 7:35 ` Geert Uytterhoeven
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