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: e519f0b ("ARM/mmc: Convert old mmci-omap to GPIO descriptors")
Signed-off-by: Miaoqian Lin <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: Yuuoniy

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;
 }