From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: MIME-Version: 1.0 Message-Id: <20120228010434.307758543@linuxfoundation.org> Date: Mon, 27 Feb 2012 17:05:25 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Pavel Roskin , "John W. Linville" Subject: [ 56/72] ath9k: stop on rates with idx -1 in ath9k rate controls .tx_status In-Reply-To: <20120228010511.GA8453@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pavel Roskin commit 2504a6423b9ab4c36df78227055995644de19edb upstream. Rate control algorithms are supposed to stop processing when they encounter a rate with the index -1. Checking for rate->count not being zero is not enough. Allowing a rate with negative index leads to memory corruption in ath_debug_stat_rc(). One consequence of the bug is discussed at https://bugzilla.redhat.com/show_bug.cgi?id=768639 Signed-off-by: Pavel Roskin Signed-off-by: John W. Linville Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/ath/ath9k/rc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/wireless/ath/ath9k/rc.c +++ b/drivers/net/wireless/ath/ath9k/rc.c @@ -1347,7 +1347,7 @@ static void ath_tx_status(void *priv, st fc = hdr->frame_control; for (i = 0; i < sc->hw->max_rates; i++) { struct ieee80211_tx_rate *rate = &tx_info->status.rates[i]; - if (!rate->count) + if (rate->idx < 0 || !rate->count) break; final_ts_idx = i;