From: Hans Dedecker <dedeckeh@gmail.com>
Date: Mon, 5 Aug 2019 20:05:36 +0000 (+0200)
Subject: system-linux: fix resource leak
X-Git-Url: https://git.librecmc.org/?p=oweals%2Fnetifd.git;a=commitdiff_plain;h=5e02f94411b06f192fb2a7d9be9abde3549153a8

system-linux: fix resource leak

Fix cb leak in case invalid type is specified in system_if_clear_entries
Detected by Coverity in CID1431183

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
---

diff --git a/system-linux.c b/system-linux.c
index c406a3d..acfd40e 100644
--- a/system-linux.c
+++ b/system-linux.c
@@ -985,7 +985,7 @@ static void
 system_if_clear_entries(struct device *dev, int type, int af)
 {
 	struct clear_data clr;
-	struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
+	struct nl_cb *cb;
 	struct rtmsg rtm = {
 		.rtm_family = af,
 		.rtm_flags = RTM_F_CLONED,
@@ -993,9 +993,6 @@ system_if_clear_entries(struct device *dev, int type, int af)
 	int flags = NLM_F_DUMP;
 	int pending = 1;
 
-	if (!cb)
-		return;
-
 	clr.af = af;
 	clr.dev = dev;
 	clr.type = type;
@@ -1011,6 +1008,10 @@ system_if_clear_entries(struct device *dev, int type, int af)
 		return;
 	}
 
+	cb = nl_cb_alloc(NL_CB_DEFAULT);
+	if (!cb)
+		return;
+
 	clr.msg = nlmsg_alloc_simple(type, flags);
 	if (!clr.msg)
 		goto out;