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ath5k: check return value of ieee80211_get_tx_rate

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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>
Cc: stable@kernel.org
Acked-by: Bob Copeland <me@bobcopeland.com>
This commit is contained in:
John W. Linville 2010-08-24 15:27:34 -04:00
parent 557de5eb29
commit d8e1ba76d6
1 changed files with 4 additions and 0 deletions
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4
drivers/net/wireless/ath/ath5k/base.c
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@ -1327,6 +1327,10 @@ 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;