linux-kernel - [PATCH v2 2/2] mmc: cqhci: Fix a tiny potential memory leak on error condition

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Message-Id: <20190225192214.3881-2-alamy.liu@gmail.com>
Date:   Mon, 25 Feb 2019 11:22:14 -0800
From:   Alamy Liu <alamy.liu@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Ritesh Harjani <riteshh@...eaurora.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH v2 2/2] mmc: cqhci: Fix a tiny potential memory leak on error condition

Free up the allocated memory in the case of error return

--- code study ---
The value of mmc_host->cqe_enabled stays 'false'.
Thus, cqhci_disable (mmc_cqe_ops->cqe_disable) won't be called to
free the memory.
Also, cqhci_disable() seems to be designed to disable and free
all resources, not suitable to handle this corner case.

Fixes: a4080225f51d ("mmc: cqhci: support for command queue enabled host")
Signed-off-by: Alamy Liu <alamy.liu@...il.com>
---
 drivers/mmc/host/cqhci.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/cqhci.c b/drivers/mmc/host/cqhci.c
index 974997b6cb..795893ba47 100644
--- a/drivers/mmc/host/cqhci.c
+++ b/drivers/mmc/host/cqhci.c
@@ -218,12 +218,21 @@ static int cqhci_host_alloc_tdl(struct cqhci_host *cq_host)
 						 cq_host->desc_size,
 						 &cq_host->desc_dma_base,
 						 GFP_KERNEL);
+	if (!cq_host->desc_base)
+		return -ENOMEM;
+
 	cq_host->trans_desc_base = dmam_alloc_coherent(mmc_dev(cq_host->mmc),
 					      cq_host->data_size,
 					      &cq_host->trans_desc_dma_base,
 					      GFP_KERNEL);
-	if (!cq_host->desc_base || !cq_host->trans_desc_base)
+	if (!cq_host->trans_desc_base) {
+		dmam_free_coherent(mmc_dev(cq_host->mmc), cq_host->desc_size,
+				   cq_host->desc_base,
+				   cq_host->desc_dma_base);
+		cq_host->desc_base = NULL;
+		cq_host->desc_dma_base = 0;
 		return -ENOMEM;
+	}
 
 	pr_debug("%s: cqhci: desc-base: 0x%p trans-base: 0x%p\n desc_dma 0x%llx trans_dma: 0x%llx\n",
 		 mmc_hostname(cq_host->mmc), cq_host->desc_base, cq_host->trans_desc_base,
-- 
2.17.1