linux-kernel - [PATCH][next] PCI: endpoint: functions/pci-epf-test: fix memory leak of buf

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Message-Id: <20200401223541.403438-1-colin.king@canonical.com>
Date:   Wed,  1 Apr 2020 23:35:41 +0100
From:   Colin King <colin.king@...onical.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] PCI: endpoint: functions/pci-epf-test: fix memory leak of buf

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

In the case where data cannot be transferred using DMA the allocation
of buf leaked on the error return path. Fix this by jumping to the
label err_dma_map that kfree's buf before the return.

Addresses-Coverity: ("Resource leak")
Fixes: a558357b1b34 ("PCI: endpoint: functions/pci-epf-test: Add DMA support to transfer data")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/pci/endpoint/functions/pci-epf-test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 3b4cf7e2bc60..60330f3e3751 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -347,7 +347,7 @@ static int pci_epf_test_read(struct pci_epf_test *epf_test)
 		if (!epf_test->dma_supported) {
 			dev_err(dev, "Cannot transfer data using DMA\n");
 			ret = -EINVAL;
-			goto err_map_addr;
+			goto err_dma_map;
 		}
 
 		dst_phys_addr = dma_map_single(dma_dev, buf, reg->size,
-- 
2.25.1