netdev - [PATCH] qed: fix memory leak of a qed_spq

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Message-Id: <20161216125039.20969-1-colin.king@canonical.com>
Date:   Fri, 16 Dec 2016 12:50:39 +0000
From:   Colin King <colin.king@...onical.com>
To:     Yuval Mintz <Yuval.Mintz@...ium.com>,
        Ariel Elior <Ariel.Elior@...ium.com>,
        everest-linux-l2@...ium.com, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] qed: fix memory leak of a qed_spq_entry on error failure paths

From: Colin Ian King <colin.king@...onical.com>

A qed_spq_entry entry is allocated by qed_sp_init_request but is not
kfree'd if an error occurs, causing a memory leak. Fix this by
kfree'ing it and also setting *pp_ent to NULL to be safe.

Found with static analysis by CoverityScan, CIDs 1389468-1389470

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/ethernet/qlogic/qed/qed_sp_commands.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_sp_commands.c b/drivers/net/ethernet/qlogic/qed/qed_sp_commands.c
index a39ef2e..273a6bb 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_sp_commands.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_sp_commands.c
@@ -55,8 +55,10 @@ int qed_sp_init_request(struct qed_hwfn *p_hwfn,
 		break;
 
 	case QED_SPQ_MODE_BLOCK:
-		if (!p_data->p_comp_data)
-			return -EINVAL;
+		if (!p_data->p_comp_data) {
+			rc = -EINVAL;
+			goto err;
+		}
 
 		p_ent->comp_cb.cookie = p_data->p_comp_data->cookie;
 		break;
@@ -71,7 +73,8 @@ int qed_sp_init_request(struct qed_hwfn *p_hwfn,
 	default:
 		DP_NOTICE(p_hwfn, "Unknown SPQE completion mode %d\n",
 			  p_ent->comp_mode);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto err;
 	}
 
 	DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
@@ -85,6 +88,11 @@ int qed_sp_init_request(struct qed_hwfn *p_hwfn,
 	memset(&p_ent->ramrod, 0, sizeof(p_ent->ramrod));
 
 	return 0;
+err:
+	kfree(*pp_ent);
+	*pp_ent = NULL;
+
+	return rc;
 }
 
 static enum tunnel_clss qed_tunn_get_clss_type(u8 type)
-- 
2.10.2