diff options
| -rw-r--r-- | net/wireless/nl80211.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index cb9f5a44ffad..5839c85075f1 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -5927,6 +5927,7 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info) int err; bool need_new_beacon = false; int len, i; + u32 cs_count; if (!rdev->ops->channel_switch || !(rdev->wiphy.flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) @@ -5963,7 +5964,14 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info) if (need_new_beacon && !info->attrs[NL80211_ATTR_CSA_IES]) return -EINVAL; - params.count = nla_get_u32(info->attrs[NL80211_ATTR_CH_SWITCH_COUNT]); + /* Even though the attribute is u32, the specification says + * u8, so let's make sure we don't overflow. + */ + cs_count = nla_get_u32(info->attrs[NL80211_ATTR_CH_SWITCH_COUNT]); + if (cs_count > 255) + return -EINVAL; + + params.count = cs_count; if (!need_new_beacon) goto skip_beacons; |