From: Ben Hutchings <ben@decadent.org.uk>
To: Willy Tarreau <w@1wt.eu>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Pavel Roskin <proski@gnu.org>,
Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>,
"John W. Linville" <linville@tuxdriver.com>
Subject: Re: [ 08/12] mac80211: zero initialize count field in ieee80211_tx_rate
Date: Mon, 12 Mar 2012 01:57:52 +0000 [thread overview]
Message-ID: <1331517472.3022.150.camel@deadeye> (raw)
In-Reply-To: <20120312002046.282831520@1wt.eu>
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On Mon, 2012-03-12 at 01:20 +0100, Willy Tarreau wrote:
> 2.6.32-longterm review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
>
> commit 8617b093d0031837a7be9b32bc674580cfb5f6b5 upstream.
>
> rate control algorithms concludes the rate as invalid
> with rate[i].idx < -1 , while they do also check for rate[i].count is
> non-zero. it would be safer to zero initialize the 'count' field.
> recently we had a ath9k rate control crash where the ath9k rate control
> in ath_tx_status assumed to check only for rate[i].count being non-zero
> in one instance and ended up in using invalid rate index for
> 'connection monitoring NULL func frames' which eventually lead to the crash.
> thanks to Pavel Roskin for fixing it and finding the root cause.
> https://bugzilla.redhat.com/show_bug.cgi?id=768639
In 2.6.32, ath_tx_status() checks that rates[i].idx >= 0, so it properly
ignores these dummy entries. Further, there is code further down the
rate_control_get_rate() function that sets .idx only and appears to
depend on the initialisation of .count = 1.
So I'm pretty sure this patch is wrong for 2.6.32; it could be
backported but I don't think the change is necessary anyway.
Ben.
> Cc: stable@vger.kernel.org
> Cc: Pavel Roskin <proski@gnu.org>
> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
> Signed-off-by: John W. Linville <linville@tuxdriver.com>
>
> diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
> index ad64f4d..f9b8e81 100644
> --- a/net/mac80211/rate.c
> +++ b/net/mac80211/rate.c
> @@ -344,7 +344,7 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
> for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
> info->control.rates[i].idx = -1;
> info->control.rates[i].flags = 0;
> - info->control.rates[i].count = 1;
> + info->control.rates[i].count = 0;
> }
>
> if (sdata->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe stable" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
Ben Hutchings
Life would be so much easier if we could look at the source code.
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next prev parent reply other threads:[~2012-03-12 1:57 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <feb44625a10a45049eddf27890e95d54@local>
2012-03-12 0:20 ` [ 00/12] 2.6.32.59-longterm review Willy Tarreau
2012-03-12 0:20 ` [ 01/12] compat: Re-add missing asm/compat.h include to fix compile breakage on s390 Willy Tarreau
2012-03-12 0:20 ` [ 02/12] Remove COMPAT_IA32 support Willy Tarreau
2012-03-12 1:07 ` Ben Hutchings
2012-03-12 2:49 ` Greg KH
2012-03-12 6:30 ` Willy Tarreau
2012-03-12 6:48 ` stripping [PATCH] without losing later tags from mailed patches (Re: [ 02/12] Remove COMPAT_IA32 support) Jonathan Nieder
2012-03-12 8:58 ` Willy Tarreau
2012-03-12 15:20 ` Greg KH
2012-03-12 15:24 ` Willy Tarreau
2012-03-12 16:41 ` Thomas Rast
2012-03-12 16:53 ` Willy Tarreau
2012-03-12 16:57 ` Jonathan Nieder
2012-03-12 18:04 ` Junio C Hamano
2012-03-12 18:50 ` Willy Tarreau
2012-03-12 18:54 ` Jonathan Nieder
2012-03-12 19:17 ` Willy Tarreau
2012-03-12 21:47 ` Thomas Rast
2012-03-12 21:56 ` [PATCH] git-am: error out when seeing -b/--binary Jonathan Nieder
2012-03-12 22:03 ` Thomas Rast
2012-03-12 22:22 ` Jonathan Nieder
2012-03-13 15:31 ` Thomas Rast
2012-03-13 17:31 ` Junio C Hamano
2012-03-13 17:51 ` Jonathan Nieder
2012-03-13 18:22 ` Junio C Hamano
2012-03-12 22:12 ` Junio C Hamano
2012-03-12 21:57 ` stripping [PATCH] without losing later tags from mailed patches (Re: [ 02/12] Remove COMPAT_IA32 support) Junio C Hamano
2012-03-12 16:40 ` Junio C Hamano
2012-03-12 16:48 ` Willy Tarreau
2012-03-12 17:57 ` Junio C Hamano
2012-03-12 18:45 ` Willy Tarreau
2012-03-12 19:29 ` Junio C Hamano
2012-03-12 17:12 ` Greg KH
2012-03-12 18:01 ` Junio C Hamano
2012-03-12 19:26 ` Greg KH
2012-03-12 19:51 ` Junio C Hamano
2012-03-12 20:19 ` Willy Tarreau
2012-03-12 15:25 ` [ 02/12] Remove COMPAT_IA32 support Ben Hutchings
2012-03-12 17:02 ` Arnd Bergmann
2012-03-12 17:14 ` Willy Tarreau
2012-03-12 19:34 ` Ben Hutchings
2012-03-12 19:45 ` Willy Tarreau
2012-03-12 0:20 ` [ 03/12] writeback: fixups for !dirty_writeback_centisecs Willy Tarreau
2012-03-12 0:20 ` [ 04/12] bsg: fix sysfs link remove warning Willy Tarreau
2012-03-12 0:20 ` [ 05/12] eCryptfs: Handle failed metadata read in lookup Willy Tarreau
2012-03-12 0:20 ` [ 06/12] [S390] KEYS: Enable the compat keyctl wrapper on s390x Willy Tarreau
2012-03-12 0:20 ` [ 07/12] cifs: fix dentry refcount leak when opening a FIFO on lookup Willy Tarreau
2012-03-12 0:20 ` [ 08/12] mac80211: zero initialize count field in ieee80211_tx_rate Willy Tarreau
2012-03-12 1:57 ` Ben Hutchings [this message]
2012-03-12 4:36 ` Mohammed Shafi Shajakhan
2012-03-12 6:34 ` Willy Tarreau
2012-03-12 6:52 ` Mohammed Shafi Shajakhan
2012-03-12 15:23 ` Ben Hutchings
2012-03-12 15:55 ` Mohammed Shafi Shajakhan
2012-03-12 16:10 ` Mohammed Shafi Shajakhan
2012-03-12 6:31 ` Willy Tarreau
2012-03-12 0:20 ` [ 09/12] net/usbnet: avoid recursive locking in usbnet_stop() Willy Tarreau
2012-03-12 0:20 ` [ 10/12] regset: Prevent null pointer reference on readonly regsets Willy Tarreau
2012-03-12 0:20 ` [ 11/12] regset: Return -EFAULT, not -EIO, on host-side memory fault Willy Tarreau
2012-03-12 0:20 ` [ 12/12] watchdog: hpwdt: clean up set_memory_x call for 32 bit Willy Tarreau
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