tree 6dc8749c061563fb004e70f65bb3cb179ac18e9e
parent 8feb69c7bd89513be80eb19198d48f154b254021
author Srinivas Dasari <dasaris@qti.qualcomm.com> 1499381022 +0300
committer Johannes Berg <johannes.berg@intel.com> 1499419471 +0200

cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES

validate_scan_freqs() retrieves frequencies from attributes
nested in the attribute NL80211_ATTR_SCAN_FREQUENCIES with
nla_get_u32(), which reads 4 bytes from each attribute
without validating the size of data received. Attributes
nested in NL80211_ATTR_SCAN_FREQUENCIES don't have an nla policy.

Validate size of each attribute before parsing to avoid potential buffer
overread.

Fixes: 2a519311926 ("cfg80211/nl80211: scanning (and mac80211 update to use it)")
Cc: stable@vger.kernel.org
Signed-off-by: Srinivas Dasari <dasaris@qti.qualcomm.com>
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>