mac80211: ethtool: avoid 32 bit multiplication overflow
The multiplication of 100000 * cfg80211_calculate_bitrate() is a 32 bit
operation and can overflow if cfg80211_calculate_bitrate is greater
than 42949. Although I don't believe this is occurring at present, it
would be safer to avoid the potential overflow by making the constant
100000 an ULL to ensure a 64 multiplication occurs.
Detected by CoverityScan, CID#1468643 ("Unintentional integer overflow")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/ethtool.c b/net/mac80211/ethtool.c
index 1afeff9..09210aa 100644
--- a/net/mac80211/ethtool.c
+++ b/net/mac80211/ethtool.c
@@ -121,11 +121,11 @@ static void ieee80211_get_stats(struct net_device *dev,
if (sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))
- data[i] = 100000 *
+ data[i] = 100000ULL *
cfg80211_calculate_bitrate(&sinfo->txrate);
i++;
if (sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))
- data[i] = 100000 *
+ data[i] = 100000ULL *
cfg80211_calculate_bitrate(&sinfo->rxrate);
i++;