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mt76: fix a possible NULL pointer dereference in mt76_testmode_dump

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Fix a possible NULL pointer dereference in mt76_testmode_dump() since
nla_nest_start returns NULL in case of error

Fixes: f0efa86215 ("mt76: add API for testmode support")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Lorenzo Bianconi 2020-08-21 12:52:15 +02:00 committed by Felix Fietkau
parent a081de174d
commit ce8463a726
1 changed files with 6 additions and 2 deletions
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8
drivers/net/wireless/mediatek/mt76/testmode.c
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@ -442,9 +442,13 @@ int mt76_testmode_dump(struct ieee80211_hw *hw, struct sk_buff *msg,
mutex_lock(&dev->mutex);
if (tb[MT76_TM_ATTR_STATS]) {
err = -EINVAL;
a = nla_nest_start(msg, MT76_TM_ATTR_STATS);
err = mt76_testmode_dump_stats(dev, msg);
nla_nest_end(msg, a);
if (a) {
err = mt76_testmode_dump_stats(dev, msg);
nla_nest_end(msg, a);
}
goto out;
}