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rtlwifi: Fix oops on rate-control failure

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When the rate-control indexing is incorrectly set up, mac80211 issues
a warning and returns NULL from the call to ieee80211_get_tx_rate().
When this happens, avoid a NULL pointer dereference.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Larry Finger 2012-04-06 16:54:17 -05:00 • committed by John W. Linville
parent aa331df0e5
commit e89f7690a3
1 changed files with 4 additions and 1 deletions
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5
drivers/net/wireless/rtlwifi/base.c
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@ -838,7 +838,10 @@ void rtl_get_tcb_desc(struct ieee80211_hw *hw,
__le16 fc = hdr->frame_control; __le16 fc = hdr->frame_control;
txrate = ieee80211_get_tx_rate(hw, info); txrate = ieee80211_get_tx_rate(hw, info);
tcb_desc->hw_rate = txrate->hw_value; if (txrate)
tcb_desc->hw_rate = txrate->hw_value;
else
tcb_desc->hw_rate = 0;
if (ieee80211_is_data(fc)) { if (ieee80211_is_data(fc)) {
/* /*