[PATCH 01/12] P2P: Fix possible NULL pointer de-reference

[Ilan Peer]

It is possible that p2p_build_prov_disc_resp() is called with a NULL
device entry, which might be de-referenced when call
p2p->cfg->get_persistent_group(). Fix this by checking the device
pointer before accessing it.

Signed-off-by: Ilan Peer <ilan.peer at intel.com>
---
 src/p2p/p2p_pd.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/src/p2p/p2p_pd.c b/src/p2p/p2p_pd.c
index 6363e36..0014466 100644
--- a/src/p2p/p2p_pd.c
+++ b/src/p2p/p2p_pd.c
@@ -309,17 +309,21 @@ static struct wpabuf * p2p_build_prov_disc_resp(struct p2p_data *p2p,
 			u8 go_dev_addr[ETH_ALEN];
 			u8 intended_addr[ETH_ALEN];
 
-			persist = p2p->cfg->get_persistent_group(
-				p2p->cfg->cb_ctx,
-				dev->info.p2p_device_addr,
-				persist_ssid, persist_ssid_len, go_dev_addr,
-				ssid, &ssid_len, intended_addr);
-			if (persist) {
-				p2p_buf_add_persistent_group_info(
-					buf, go_dev_addr, ssid, ssid_len);
-				if (!is_zero_ether_addr(intended_addr))
-					p2p_buf_add_intended_addr(
-						buf, intended_addr);
+			if (dev) {
+				persist = p2p->cfg->get_persistent_group(
+					p2p->cfg->cb_ctx,
+					dev->info.p2p_device_addr,
+					persist_ssid, persist_ssid_len,
+					go_dev_addr,
+					ssid, &ssid_len, intended_addr);
+				if (persist) {
+					p2p_buf_add_persistent_group_info(
+						buf, go_dev_addr, ssid,
+						ssid_len);
+					if (!is_zero_ether_addr(intended_addr))
+						p2p_buf_add_intended_addr(
+							buf, intended_addr);
+				}
 			}
 		}
 
-- 
1.9.1