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: 2a51931192
("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>
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@ -6469,6 +6469,10 @@ static int validate_scan_freqs(struct nlattr *freqs)
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struct nlattr *attr1, *attr2;
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int n_channels = 0, tmp1, tmp2;
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nla_for_each_nested(attr1, freqs, tmp1)
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if (nla_len(attr1) != sizeof(u32))
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return 0;
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nla_for_each_nested(attr1, freqs, tmp1) {
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n_channels++;
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/*
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