linux-kernel - [096/129] ath5k: check return value of ieee80211_get_tx

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Message-Id: <20100918191305.573013202@clark.site>
Date:	Sat, 18 Sep 2010 12:13:14 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"John W. Linville" <linville@...driver.com>,
	Bob Copeland <me@...copeland.com>
Subject: [096/129] ath5k: check return value of ieee80211_get_tx_rate

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: John W. Linville <linville@...driver.com>

commit d8e1ba76d619dbc0be8fbeee4e6c683b5c812d3a upstream.

This avoids a NULL pointer dereference as reported here:

	https://bugzilla.redhat.com/show_bug.cgi?id=625889

When the WARN condition is hit in ieee80211_get_tx_rate, it will return
NULL.  So, we need to check the return value and avoid dereferencing it
in that case.

Signed-off-by: John W. Linville <linville@...driver.com>
Acked-by: Bob Copeland <me@...copeland.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/net/wireless/ath/ath5k/base.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -1318,6 +1318,10 @@ ath5k_txbuf_setup(struct ath5k_softc *sc
 			PCI_DMA_TODEVICE);

 	rate = ieee80211_get_tx_rate(sc->hw, info);
+	if (!rate) {
+		ret = -EINVAL;
+		goto err_unmap;
+	}

 	if (info->flags & IEEE80211_TX_CTL_NO_ACK)
 		flags |= AR5K_TXDESC_NOACK;

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