From: Lorenzo Bianconi Date: Fri, 21 Aug 2020 10:52:15 +0000 (+0200) Subject: mt76: fix a possible NULL pointer dereference in mt76_testmode_dump X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ce8463a726a5669b200a1c2c17f95bc1394cc6bf;p=linux.git mt76: fix a possible NULL pointer dereference in mt76_testmode_dump Fix a possible NULL pointer dereference in mt76_testmode_dump() since nla_nest_start returns NULL in case of error Fixes: f0efa8621550e ("mt76: add API for testmode support") Signed-off-by: Lorenzo Bianconi Signed-off-by: Felix Fietkau --- diff --git a/drivers/net/wireless/mediatek/mt76/testmode.c b/drivers/net/wireless/mediatek/mt76/testmode.c index 75bb02cdfdae4..5bd6ac1ba3b5b 100644 --- a/drivers/net/wireless/mediatek/mt76/testmode.c +++ b/drivers/net/wireless/mediatek/mt76/testmode.c @@ -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; }