linux-kernel - Re: [PATCH] net: bluetooth: fix locking problem

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Message-ID: <AANLkTi=5GpSEsGNMcfTVDyo_cHoELPaD8EmJGUhPxPw2@mail.gmail.com>
Date:	Mon, 17 Jan 2011 12:28:29 +0200
From:	Andrei Emeltchenko <andrei.emeltchenko.news@...il.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	kernel-janitors@...r.kernel.org,
	Marcel Holtmann <marcel@...tmann.org>,
	"Gustavo F. Padovan" <padovan@...fusion.mobi>,
	"David S. Miller" <davem@...emloft.net>,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: bluetooth: fix locking problem

On Mon, Jan 17, 2011 at 12:08 PM, Vasiliy Kulikov <segoon@...nwall.com> wrote:
> If alloc_skb() failed we still hold hci_dev_list_lock.  The code should
> unlock it before exit.
>
> Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
> ---
>  Compile tested only.
>
>  net/bluetooth/mgmt.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> index f827fd9..ace8726 100644
> --- a/net/bluetooth/mgmt.c
> +++ b/net/bluetooth/mgmt.c
> @@ -111,8 +111,10 @@ static int read_index_list(struct sock *sk)
>
>        body_len = sizeof(*ev) + sizeof(*rp) + (2 * count);
>        skb = alloc_skb(sizeof(*hdr) + body_len, GFP_ATOMIC);
> -       if (!skb)
> +       if (!skb) {
> +               read_unlock(&hci_dev_list_lock);
>                return -ENOMEM;
> +       }

patch was send already on weekend

>
>        hdr = (void *) skb_put(skb, sizeof(*hdr));
>        hdr->opcode = cpu_to_le16(MGMT_EV_CMD_COMPLETE);
> --
> 1.7.0.4
>
> --
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