netdev - [PATCH 1/2] batman-adv: Return directly after a failed batadv_dat_select_candidates() in batadv_dat_forward

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Message-ID: <54dc53f8-5f08-4f1d-938a-c845c8ec0d44@web.de>
Date: Tue, 2 Jan 2024 08:11:47 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: b.a.t.m.a.n@...ts.open-mesh.org, netdev@...r.kernel.org,
 kernel-janitors@...r.kernel.org, Antonio Quartulli <a@...table.cc>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Marek Lindner
 <mareklindner@...mailbox.ch>, Paolo Abeni <pabeni@...hat.com>,
 Simon Wunderlich <sw@...onwunderlich.de>, Sven Eckelmann <sven@...fation.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] batman-adv: Return directly after a failed
 batadv_dat_select_candidates() in batadv_dat_forward_data()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 2 Jan 2024 07:27:45 +0100

The kfree() function was called in one case by
the batadv_dat_forward_data() function during error handling
even if the passed variable contained a null pointer.
This issue was detected by using the Coccinelle software.

* Thus return directly after a batadv_dat_select_candidates() call failed
  at the beginning.

* Delete the label “out” which became unnecessary with this refactoring.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 net/batman-adv/distributed-arp-table.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index 28a939d56090..4c7e85534324 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -684,7 +684,7 @@ static bool batadv_dat_forward_data(struct batadv_priv *bat_priv,

 	cand = batadv_dat_select_candidates(bat_priv, ip, vid);
 	if (!cand)
-		goto out;
+		return ret;

 	batadv_dbg(BATADV_DBG_DAT, bat_priv, "DHT_SEND for %pI4\n", &ip);

@@ -728,7 +728,6 @@ static bool batadv_dat_forward_data(struct batadv_priv *bat_priv,
 		batadv_orig_node_put(cand[i].orig_node);
 	}

-out:
 	kfree(cand);
 	return ret;
 }
--
2.43.0