linux-kernel - [PATCH] nfp: Fix memory leak in nfp_resource

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Message-Id: <20200409150210.15488-1-keitasuzuki.park@sslab.ics.keio.ac.jp>
Date:   Thu,  9 Apr 2020 15:02:07 +0000
From:   Keita Suzuki <keitasuzuki.park@...ab.ics.keio.ac.jp>
To:     unlisted-recipients:; (no To-header on input)
Cc:     keitasuzuki.park@...ab.ics.keio.ac.jp,
        takafumi.kubota1012@...ab.ics.keio.ac.jp,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        oss-drivers@...ronome.com (open list:NETRONOME ETHERNET DRIVERS),
        netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] nfp: Fix memory leak in nfp_resource_acquire()

This patch fixes a memory leak in nfp_resource_acquire(). res->mutex is
alllocated in nfp_resource_try_acquire(). However, when
msleep_interruptible() or time_is_before_eq_jiffies() fails, it falls
into err_fails path where res is freed, but res->mutex is not.

Fix this by changing call to free to nfp_resource_release().

Signed-off-by: Keita Suzuki <keitasuzuki.park@...ab.ics.keio.ac.jp>
---
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c
index ce7492a6a98f..95e7bdc95652 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_resource.c
@@ -200,7 +200,7 @@ nfp_resource_acquire(struct nfp_cpp *cpp, const char *name)
 
 err_free:
 	nfp_cpp_mutex_free(dev_mutex);
-	kfree(res);
+	nfp_resource_relase(res);
 	return ERR_PTR(err);
 }
 
-- 
2.17.1