[PATCH ethtool 1/2] fix memory leaks in do_sfeatures()

* [PATCH ethtool 1/2] fix memory leaks in do_sfeatures()
@ 2020-09-25  7:05 Ivan Vecera
  2020-09-25  7:05 ` [PATCH ethtool 2/2] netlink: fix copy-paste error in rtm_link_summary() Ivan Vecera
  2020-09-28 15:37 ` [PATCH ethtool 1/2] fix memory leaks in do_sfeatures() Michal Kubecek
  0 siblings, 2 replies; 4+ messages in thread
From: Ivan Vecera @ 2020-09-25  7:05 UTC (permalink / raw)
  To: netdev; +Cc: Michal Kubecek

Memory blocks referenced by new_state and old_state are never freed.
For efeatures there is no need to check pointer as free() can be called
with NULL parameter.

Fixes: 6042804cf6ec ("Change -k/-K options to use ETHTOOL_{G,S}FEATURES")

Cc: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
---
 ethtool.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/ethtool.c b/ethtool.c
index ab9b4577cbce..f2d568722272 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -2392,9 +2392,10 @@ static int do_sfeatures(struct cmd_context *ctx)
 	int any_changed = 0, any_mismatch = 0;
 	u32 off_flags_wanted = 0;
 	u32 off_flags_mask = 0;
-	struct ethtool_sfeatures *efeatures;
+	struct ethtool_sfeatures *efeatures = NULL;
+	struct feature_state *old_state = NULL;
+	struct feature_state *new_state = NULL;
 	struct cmdline_info *cmdline_features;
-	struct feature_state *old_state, *new_state;
 	struct ethtool_value eval;
 	unsigned int i, j;
 	int err, rc;
@@ -2418,8 +2419,6 @@ static int do_sfeatures(struct cmd_context *ctx)
 		memset(efeatures->features, 0,
 		       FEATURE_BITS_TO_BLOCKS(defs->n_features) *
 		       sizeof(efeatures->features[0]));
-	} else {
-		efeatures = NULL;
 	}
 
 	/* Generate cmdline_info for legacy flags and kernel-named
@@ -2578,9 +2577,11 @@ static int do_sfeatures(struct cmd_context *ctx)
 	rc = 0;
 
 err:
+	free(new_state);
+	free(old_state);
 	free(defs);
-	if (efeatures)
-		free(efeatures);
+	free(efeatures);
+
 	return rc;
 }
 
-- 
2.26.2


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