linux-kernel - [PATCH] net: flow_offload: fix memory leak in nfp_abm_u32_knode

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Message-Id: <20190925183457.32695-1-navid.emamdoost@gmail.com>
Date:   Wed, 25 Sep 2019 13:34:46 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     emamd001@....edu, smccaman@....edu, kjlu@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "David S. Miller" <davem@...emloft.net>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Colin Ian King <colin.king@...onical.com>,
        oss-drivers@...ronome.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: flow_offload: fix memory leak in nfp_abm_u32_knode_replace

In nfp_abm_u32_knode_replace if the allocation for match fails it should
go to the error handling instead of returning.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
 drivers/net/ethernet/netronome/nfp/abm/cls.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/netronome/nfp/abm/cls.c b/drivers/net/ethernet/netronome/nfp/abm/cls.c
index 23ebddfb9532..32eaab99d96c 100644
--- a/drivers/net/ethernet/netronome/nfp/abm/cls.c
+++ b/drivers/net/ethernet/netronome/nfp/abm/cls.c
@@ -174,7 +174,7 @@ nfp_abm_u32_knode_replace(struct nfp_abm_link *alink,
 	struct nfp_abm_u32_match *match = NULL, *iter;
 	unsigned int tos_off;
 	u8 mask, val;
-	int err;
+	int err, ret = -EOPNOTSUPP;
 
 	if (!nfp_abm_u32_check_knode(alink->abm, knode, proto, extack))
 		goto err_delete;
@@ -204,8 +204,11 @@ nfp_abm_u32_knode_replace(struct nfp_abm_link *alink,
 
 	if (!match) {
 		match = kzalloc(sizeof(*match), GFP_KERNEL);
-		if (!match)
-			return -ENOMEM;
+		if (!match) {
+			ret = -ENOMEM;
+			goto err_delete;
+		}
+
 		list_add(&match->list, &alink->dscp_map);
 	}
 	match->handle = knode->handle;
@@ -221,7 +224,7 @@ nfp_abm_u32_knode_replace(struct nfp_abm_link *alink,
 
 err_delete:
 	nfp_abm_u32_knode_delete(alink, knode);
-	return -EOPNOTSUPP;
+	return ret;
 }
 
 static int nfp_abm_setup_tc_block_cb(enum tc_setup_type type,
-- 
2.17.1