linux-kernel - [PATCH] staging: ks7010_sdio: fix NULL pointer dereference and memory leak

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Date:   Thu, 12 Apr 2018 09:30:09 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] staging: ks7010_sdio: fix NULL pointer dereference and
 memory leak

priv is being dereferenced when it is still null, hence there is an
explicit null pointer dereference at line 935: free_netdev(priv->net_dev)

Also, memory allocated for netdev at line 854:
netdev = alloc_etherdev(sizeof(*priv));
is not being free'd, hence there is a memory leak.

Fix this by null checking priv before dererefencing it and free netdev
before return.

Addresses-Coverity-ID: 1467844 ("Explicit null dereferenced")
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/staging/ks7010/ks7010_sdio.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/ks7010/ks7010_sdio.c b/drivers/staging/ks7010/ks7010_sdio.c
index b8f55a1..f5d4c62 100644
--- a/drivers/staging/ks7010/ks7010_sdio.c
+++ b/drivers/staging/ks7010/ks7010_sdio.c
@@ -932,8 +932,12 @@ static int ks7010_sdio_probe(struct sdio_func *func,
 	return 0;
 
  err_free_netdev:
-	free_netdev(priv->net_dev);
-	card->priv = NULL;
+	if (priv) {
+		free_netdev(priv->net_dev);
+		card->priv = NULL;
+	} else {
+		free_netdev(netdev);
+	}
  err_release_irq:
 	sdio_claim_host(func);
 	sdio_release_irq(func);
-- 
2.7.4