linux-kernel - [PATCH] mmc: omap: Fix memory leak in mmc_omap_new

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Message-Id: <20250318140226.19650-1-linmq006@gmail.com>
Date: Tue, 18 Mar 2025 22:02:25 +0800
From: Miaoqian Lin <linmq006@...il.com>
To: Aaro Koskinen <aaro.koskinen@....fi>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Aubin Constans <aubin.constans@...rochip.com>,
	Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	Christian Loehle <christian.loehle@....com>,
	Allen Pais <allen.lkml@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-omap@...r.kernel.org,
	linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: linmq006@...il.com
Subject: [PATCH] mmc: omap: Fix memory leak in mmc_omap_new_slot

Add err_free_host label to properly pair mmc_alloc_host() with
mmc_free_host() in GPIO error paths. The allocated host memory was
leaked when GPIO lookups failed.

Fixes: e519f0bb64ef ("ARM/mmc: Convert old mmci-omap to GPIO descriptors")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/mmc/host/omap.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 62252ad4e20d..3cdb2fc44965 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -1272,19 +1272,25 @@ static int mmc_omap_new_slot(struct mmc_omap_host *host, int id)
 	/* Check for some optional GPIO controls */
 	slot->vsd = devm_gpiod_get_index_optional(host->dev, "vsd",
 						  id, GPIOD_OUT_LOW);
-	if (IS_ERR(slot->vsd))
-		return dev_err_probe(host->dev, PTR_ERR(slot->vsd),
+	if (IS_ERR(slot->vsd)) {
+		r = dev_err_probe(host->dev, PTR_ERR(slot->vsd),
 				     "error looking up VSD GPIO\n");
+		goto err_free_host;
+	}
 	slot->vio = devm_gpiod_get_index_optional(host->dev, "vio",
 						  id, GPIOD_OUT_LOW);
-	if (IS_ERR(slot->vio))
-		return dev_err_probe(host->dev, PTR_ERR(slot->vio),
+	if (IS_ERR(slot->vio)) {
+		r = dev_err_probe(host->dev, PTR_ERR(slot->vio),
 				     "error looking up VIO GPIO\n");
+		goto err_free_host;
+	}
 	slot->cover = devm_gpiod_get_index_optional(host->dev, "cover",
 						    id, GPIOD_IN);
-	if (IS_ERR(slot->cover))
-		return dev_err_probe(host->dev, PTR_ERR(slot->cover),
+	if (IS_ERR(slot->cover)) {
+		r = dev_err_probe(host->dev, PTR_ERR(slot->cover),
 				     "error looking up cover switch GPIO\n");
+		goto err_free_host;
+	}
 
 	host->slots[id] = slot;
 
@@ -1344,6 +1350,7 @@ static int mmc_omap_new_slot(struct mmc_omap_host *host, int id)
 		device_remove_file(&mmc->class_dev, &dev_attr_slot_name);
 err_remove_host:
 	mmc_remove_host(mmc);
+err_free_host:
 	mmc_free_host(mmc);
 	return r;
 }
-- 
2.39.5 (Apple Git-154)