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: 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>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
parent
1e03cf1b8b
commit
724d320d4b
|
@ -5212,6 +5212,10 @@ 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++;
|
||||
/*
|
||||
|
|
Loading…
Reference in New Issue