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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>
This commit is contained in:
Colin Ian King 2018-05-08 13:57:32 +01:00 committed by Johannes Berg
parent 2fe4a29a45
commit 57c6cb8171
1 changed files with 2 additions and 2 deletions
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4
net/mac80211/ethtool.c
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@ -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++;