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| author | Srinivas Dasari <dasaris@qti.qualcomm.com> | 2017-07-07 01:43:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-21 09:12:21 +0300 |
| commit | e9e04fa55ae6540720af2dba5a955666014260a1 (patch) | |
| tree | 21d881be8c8222077208610ff3e211c11369128b /net/wireless | |
| parent | 55520ec2ca6a85ab1e2a51210f414cf0f9f5fe7a (diff) | |
| download | linux-e9e04fa55ae6540720af2dba5a955666014260a1.tar.xz | |
cfg80211: Validate frequencies nested in NL80211_ATTR_SCAN_FREQUENCIES
commit d7f13f7450369281a5d0ea463cc69890a15923ae upstream.
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)")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/wireless')
| -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 33346206540c..68a358324e94 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -5348,6 +5348,10 @@ 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++; /* |