ath5k: check return value of ieee80211_get_tx_rate

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@tuxdriver.com>
Acked-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c
index ab9fe22..f1e3469 100644 (file)
--- 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, struct ath5k_buf *bf,
                        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;