netdev - [PATCH ethtool] netlink: fix allocation failure handling in dump

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Message-Id: <20201014164952.CC0C860731@lion.mk-sys.cz>
Date:   Wed, 14 Oct 2020 18:49:52 +0200 (CEST)
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     ivecera@...hat.com
Subject: [PATCH ethtool] netlink: fix allocation failure handling in
 dump_features()

On allocation failure, dump_features() would set ret to -ENOMEM but then
return 0 anyway. As there is nothing to free in this case anyway, the
easiest fix is to simply return -ENOMEM rather than jumping to out_free
label - which can be dropped as well as this was its only use.

Fixes: f2c17e107900 ("netlink: add netlink handler for gfeatures (-k)")
Reported-by: Ivan Vecera <ivecera@...hat.com>
Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
 netlink/features.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/netlink/features.c b/netlink/features.c
index 3f1240437350..2a0899e6eb04 100644
--- a/netlink/features.c
+++ b/netlink/features.c
@@ -117,11 +117,9 @@ int dump_features(const struct nlattr *const *tb,
 	ret = prepare_feature_results(tb, &results);
 	if (ret < 0)
 		return -EFAULT;
-
-	ret = -ENOMEM;
 	feature_flags = calloc(results.count, sizeof(feature_flags[0]));
 	if (!feature_flags)
-		goto out_free;
+		return -ENOMEM;
 
 	/* map netdev features to legacy flags */
 	for (i = 0; i < results.count; i++) {
@@ -182,7 +180,6 @@ int dump_features(const struct nlattr *const *tb,
 		dump_feature(&results, NULL, NULL, i, name, "");
 	}
 
-out_free:
 	free(feature_flags);
 	return 0;
 }
-- 
2.28.0