linux-kernel - [PATCH 5.10 60/83] gve: Avoid freeing NULL pointer

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Message-Id: <20211011134510.460465207@linuxfoundation.org>
Date:   Mon, 11 Oct 2021 15:46:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tao Liu <xliutaox@...gle.com>,
        Catherine Sully <csully@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 60/83] gve: Avoid freeing NULL pointer

From: Tao Liu <xliutaox@...gle.com>

[ Upstream commit 922aa9bcac92b3ab6a423526a8e785b35a60b441 ]

Prevent possible crashes when cleaning up after unsuccessful
initializations.

Fixes: 893ce44df5658 ("gve: Add basic driver framework for Compute Engine Virtual NIC")
Signed-off-by: Tao Liu <xliutaox@...gle.com>
Signed-off-by: Catherine Sully <csully@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/google/gve/gve_main.c | 27 ++++++++++++++--------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
index 0b714b606ba1..22b2c6a8d08f 100644
--- a/drivers/net/ethernet/google/gve/gve_main.c
+++ b/drivers/net/ethernet/google/gve/gve_main.c
@@ -71,6 +71,9 @@ static int gve_alloc_counter_array(struct gve_priv *priv)
 
 static void gve_free_counter_array(struct gve_priv *priv)
 {
+	if (!priv->counter_array)
+		return;
+
 	dma_free_coherent(&priv->pdev->dev,
 			  priv->num_event_counters *
 			  sizeof(*priv->counter_array),
@@ -131,6 +134,9 @@ static int gve_alloc_stats_report(struct gve_priv *priv)
 
 static void gve_free_stats_report(struct gve_priv *priv)
 {
+	if (!priv->stats_report)
+		return;
+
 	del_timer_sync(&priv->stats_report_timer);
 	dma_free_coherent(&priv->pdev->dev, priv->stats_report_len,
 			  priv->stats_report, priv->stats_report_bus);
@@ -301,18 +307,19 @@ static void gve_free_notify_blocks(struct gve_priv *priv)
 {
 	int i;
 
-	if (priv->msix_vectors) {
-		/* Free the irqs */
-		for (i = 0; i < priv->num_ntfy_blks; i++) {
-			struct gve_notify_block *block = &priv->ntfy_blocks[i];
-			int msix_idx = i;
+	if (!priv->msix_vectors)
+		return;
 
-			irq_set_affinity_hint(priv->msix_vectors[msix_idx].vector,
-					      NULL);
-			free_irq(priv->msix_vectors[msix_idx].vector, block);
-		}
-		free_irq(priv->msix_vectors[priv->mgmt_msix_idx].vector, priv);
+	/* Free the irqs */
+	for (i = 0; i < priv->num_ntfy_blks; i++) {
+		struct gve_notify_block *block = &priv->ntfy_blocks[i];
+		int msix_idx = i;
+
+		irq_set_affinity_hint(priv->msix_vectors[msix_idx].vector,
+				      NULL);
+		free_irq(priv->msix_vectors[msix_idx].vector, block);
 	}
+	free_irq(priv->msix_vectors[priv->mgmt_msix_idx].vector, priv);
 	dma_free_coherent(&priv->pdev->dev,
 			  priv->num_ntfy_blks * sizeof(*priv->ntfy_blocks),
 			  priv->ntfy_blocks, priv->ntfy_block_bus);
-- 
2.33.0