linux-kernel - [PATCH v3] nfp: abm: fix memory leak in nfp_abm_u32_knode

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Message-Id: <20190927015157.20070-1-navid.emamdoost@gmail.com>
Date:   Thu, 26 Sep 2019 20:51:46 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     jakub.kicinski@...ronome.com
Cc:     emamd001@....edu, smccaman@....edu, kjlu@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        John Hurley <john.hurley@...ronome.com>,
        Colin Ian King <colin.king@...onical.com>,
        oss-drivers@...ronome.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3] nfp: abm: 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. Updated other gotos to
have correct errno returned, too.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
Changes in v2:
	- Reused err variable for erorr value returning.
Changes in v3:
	- Fix the err value in the first goto, and fix subject prefix.
---
 drivers/net/ethernet/netronome/nfp/abm/cls.c | 14 ++++++++++----
 1 file changed, 10 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..9f8a1f69c0c4 100644
--- a/drivers/net/ethernet/netronome/nfp/abm/cls.c
+++ b/drivers/net/ethernet/netronome/nfp/abm/cls.c
@@ -176,8 +176,10 @@ nfp_abm_u32_knode_replace(struct nfp_abm_link *alink,
 	u8 mask, val;
 	int err;
 
-	if (!nfp_abm_u32_check_knode(alink->abm, knode, proto, extack))
+	if (!nfp_abm_u32_check_knode(alink->abm, knode, proto, extack)) {
+		err = -EOPNOTSUPP;
 		goto err_delete;
+	}
 
 	tos_off = proto == htons(ETH_P_IP) ? 16 : 20;
 
@@ -198,14 +200,18 @@ nfp_abm_u32_knode_replace(struct nfp_abm_link *alink,
 		if ((iter->val & cmask) == (val & cmask) &&
 		    iter->band != knode->res->classid) {
 			NL_SET_ERR_MSG_MOD(extack, "conflict with already offloaded filter");
+			err = -EOPNOTSUPP;
 			goto err_delete;
 		}
 	}
 
 	if (!match) {
 		match = kzalloc(sizeof(*match), GFP_KERNEL);
-		if (!match)
-			return -ENOMEM;
+		if (!match) {
+			err = -ENOMEM;
+			goto err_delete;
+		}
+
 		list_add(&match->list, &alink->dscp_map);
 	}
 	match->handle = knode->handle;
@@ -221,7 +227,7 @@ nfp_abm_u32_knode_replace(struct nfp_abm_link *alink,
 
 err_delete:
 	nfp_abm_u32_knode_delete(alink, knode);
-	return -EOPNOTSUPP;
+	return err;
 }
 
 static int nfp_abm_setup_tc_block_cb(enum tc_setup_type type,
-- 
2.17.1