linux-kernel - [PATCH 5.14 053/432] nvmem: core: fix error handling while validating keepout regions

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Message-Id: <20210916155812.597214198@linuxfoundation.org>
Date:   Thu, 16 Sep 2021 17:56:42 +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,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 5.14 053/432] nvmem: core: fix error handling while validating keepout regions

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

commit de0534df93474f268486c486ea7e01b44a478026 upstream.

Current error path on failure of validating keepout regions is calling
put_device, eventhough the device is not even registered at that point.

Fix this by adding proper error handling of freeing ida and nvmem.

Fixes: fd3bb8f54a88 ("nvmem: core: Add support for keepout regions")
Cc: <stable@...r.kernel.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Link: https://lore.kernel.org/r/20210806085947.22682-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nvmem/core.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -824,8 +824,11 @@ struct nvmem_device *nvmem_register(cons
 
 	if (nvmem->nkeepout) {
 		rval = nvmem_validate_keepouts(nvmem);
-		if (rval)
-			goto err_put_device;
+		if (rval) {
+			ida_free(&nvmem_ida, nvmem->id);
+			kfree(nvmem);
+			return ERR_PTR(rval);
+		}
 	}
 
 	dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name);