netdev - [PATCH ethtool 2/3] Fix reported memory leak.

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Message-Id: <853fd3b0ec3d38ee5ffbdc95abc0367dd05db7d3.1682894692.git.nvinson234@gmail.com>
Date:   Sun, 30 Apr 2023 18:50:51 -0400
From:   Nicholas Vinson <nvinson234@...il.com>
To:     mkubecek@...e.cz
Cc:     Nicholas Vinson <nvinson234@...il.com>, netdev@...r.kernel.org
Subject: [PATCH ethtool 2/3] Fix reported memory leak.

Found via gcc -fanalyzer. In the function nl_sfeatures() malloc() is
called to allocate a block of memory; however, that memory block is
never explictily freed.

Signed-off-by: Nicholas Vinson <nvinson234@...il.com>
---
 netlink/features.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/netlink/features.c b/netlink/features.c
index a93f3e7..5711ff4 100644
--- a/netlink/features.c
+++ b/netlink/features.c
@@ -534,24 +534,36 @@ int nl_sfeatures(struct cmd_context *ctx)
 	nlctx->devname = ctx->devname;
 	ret = msg_init(nlctx, msgbuff, ETHTOOL_MSG_FEATURES_SET,
 		       NLM_F_REQUEST | NLM_F_ACK);
-	if (ret < 0)
+	if (ret < 0) {
+		free(sfctx);
 		return 2;
+	}
 	if (ethnla_fill_header(msgbuff, ETHTOOL_A_FEATURES_HEADER, ctx->devname,
-			       ETHTOOL_FLAG_COMPACT_BITSETS))
+			       ETHTOOL_FLAG_COMPACT_BITSETS)) {
+		free(sfctx);
 		return -EMSGSIZE;
+	}
 	ret = fill_sfeatures_bitmap(nlctx, feature_names);
-	if (ret < 0)
+	if (ret < 0) {
+		free(sfctx);
 		return ret;
+	}
 
 	ret = nlsock_sendmsg(nlsk, NULL);
-	if (ret < 0)
+	if (ret < 0) {
+		free(sfctx);
 		return 92;
+	}
 	ret = nlsock_process_reply(nlsk, sfeatures_reply_cb, nlctx);
 	if (sfctx->nothing_changed) {
 		fprintf(stderr, "Could not change any device features\n");
+		free(sfctx);
 		return nlctx->exit_code ?: 1;
 	}
-	if (ret == 0)
+	if (ret == 0) {
+		free(sfctx);
 		return 0;
+	}
+	free(sfctx);
 	return nlctx->exit_code ?: 92;
 }
-- 
2.40.1