nl80211: fix OBSS PD min and max offset validation

[ Upstream commit 6c8b6e4a5f745ec49286ac0a3f1d591a34818f82 ]

The SRG min and max offset won't present when SRG Information Present of
SR control field of Spatial Reuse Parameter Set element set to 0. Per
spec. IEEE802.11ax D7.0, SRG OBSS PD Min Offset ≤ SRG OBSS PD Max
Offset. Hence fix the constrain check to allow same values in both
offset and also call appropriate nla_get function to read the values.

Fixes: 796e90f42b7e ("cfg80211: add support for parsing OBBS_PD attributes")
Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
Link: https://lore.kernel.org/r/1601278091-20313-1-git-send-email-rmanohar@codeaurora.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 7bc4f37655237e23d1ebcb992d343edf6d41b88a..3faad3b147376879e230882fc502f91498a4da32 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4496,16 +4496,14 @@ static int nl80211_parse_he_obss_pd(struct nlattr *attrs,
        if (err)
                return err;
 
-       if (!tb[NL80211_HE_OBSS_PD_ATTR_MIN_OFFSET] ||
-           !tb[NL80211_HE_OBSS_PD_ATTR_MAX_OFFSET])
-               return -EINVAL;
-
-       he_obss_pd->min_offset =
-               nla_get_u32(tb[NL80211_HE_OBSS_PD_ATTR_MIN_OFFSET]);
-       he_obss_pd->max_offset =
-               nla_get_u32(tb[NL80211_HE_OBSS_PD_ATTR_MAX_OFFSET]);
-
-       if (he_obss_pd->min_offset >= he_obss_pd->max_offset)
+       if (tb[NL80211_HE_OBSS_PD_ATTR_MIN_OFFSET])
+               he_obss_pd->min_offset =
+                       nla_get_u8(tb[NL80211_HE_OBSS_PD_ATTR_MIN_OFFSET]);
+       if (tb[NL80211_HE_OBSS_PD_ATTR_MAX_OFFSET])
+               he_obss_pd->max_offset =
+                       nla_get_u8(tb[NL80211_HE_OBSS_PD_ATTR_MAX_OFFSET]);
+
+       if (he_obss_pd->min_offset > he_obss_pd->max_offset)
                return -EINVAL;
 
        he_obss_pd->enable = true;