From: Patrick Eigensatz <patrickeigensatz@gmail.com>
Date: Mon, 1 Jun 2020 11:12:01 +0000 (+0200)
Subject: ipv4: nexthop: Fix deadcode issue by performing a proper NULL check
X-Git-Tag: v5.10.7~2469^2~35
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dafe2078a75af1abe4780313ef8dd8491ba8598f;p=platform%2Fkernel%2Flinux-rpi.git

ipv4: nexthop: Fix deadcode issue by performing a proper NULL check

After allocating the spare nexthop group it should be tested for kzalloc()
returning NULL, instead the already used nexthop group (which cannot be
NULL at this point) had been tested so far.

Additionally, if kzalloc() fails, return ERR_PTR(-ENOMEM) instead of NULL.

Coverity-id: 1463885
Reported-by: Coverity <scan-admin@coverity.com>
Signed-off-by: Patrick Eigensatz <patrickeigensatz@gmail.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
index ebafa5e..400a9f8 100644
--- a/net/ipv4/nexthop.c
+++ b/net/ipv4/nexthop.c
@@ -1185,10 +1185,10 @@ static struct nexthop *nexthop_create_group(struct net *net,
 
 	/* spare group used for removals */
 	nhg->spare = nexthop_grp_alloc(num_nh);
-	if (!nhg) {
+	if (!nhg->spare) {
 		kfree(nhg);
 		kfree(nh);
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 	}
 	nhg->spare->spare = nhg;