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authorJohannes Berg <johannes.berg@intel.com>2021-09-30 14:11:21 +0300
committerJohannes Berg <johannes.berg@intel.com>2021-10-01 12:02:27 +0300
commita2083eeb119fb9307258baea9b7c243ca9a2e0b6 (patch)
tree75f565f3b331c4cb56a88b35557ca81ef67d2fc6 /net/wireless/scan.c
parent636707e593120c9fa35f6a908c0d052f6154910d (diff)
downloadlinux-a2083eeb119fb9307258baea9b7c243ca9a2e0b6.tar.xz
cfg80211: scan: fix RCU in cfg80211_add_nontrans_list()
The SSID pointer is pointing to RCU protected data, so we need to have it under rcu_read_lock() for the entire use. Fix this. Cc: stable@vger.kernel.org Fixes: 0b8fb8235be8 ("cfg80211: Parsing of Multiple BSSID information in scanning") Link: https://lore.kernel.org/r/20210930131120.6ddfc603aa1d.I2137344c4e2426525b1a8e4ce5fca82f8ecbfe7e@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/scan.c')
-rw-r--r--net/wireless/scan.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 11c68b159324..adc0d14cfd86 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -418,14 +418,17 @@ cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
}
ssid_len = ssid[1];
ssid = ssid + 2;
- rcu_read_unlock();
/* check if nontrans_bss is in the list */
list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
- if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
+ if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len)) {
+ rcu_read_unlock();
return 0;
+ }
}
+ rcu_read_unlock();
+
/* add to the list */
list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
return 0;