diff options
| author | Srinivas Dasari <dasaris@qti.qualcomm.com> | 2017-07-07 01:43:42 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2017-07-07 11:24:31 +0200 |
| commit | d7f13f7450369281a5d0ea463cc69890a15923ae (patch) | |
| tree | 6dc8749c061563fb004e70f65bb3cb179ac18e9e | |
| parent | 8feb69c7bd89513be80eb19198d48f154b254021 (diff) | |
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>
| -rw-r--r-- | net/wireless/nl80211.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 59f1ea5a83ef..571aed1e6f36 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -6469,6 +6469,10 @@ static int validate_scan_freqs(struct nlattr *freqs) struct nlattr *attr1, *attr2; int n_channels = 0, tmp1, tmp2; + nla_for_each_nested(attr1, freqs, tmp1) + if (nla_len(attr1) != sizeof(u32)) + return 0; + nla_for_each_nested(attr1, freqs, tmp1) { n_channels++; /* |