linux-kernel - [PATCH v2] misc: Return error on error path

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Date:   Tue,  1 Aug 2017 16:25:59 +0300
From:   Anton Vasilyev <vasilyev@...ras.ru>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Anton Vasilyev <vasilyev@...ras.ru>,
        Colin Ian King <colin.king@...onical.com>,
        Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH v2] misc: Return error on error path

If ibmasm_event_buffer_init() or ibmasm_heartbeat_init() fails,
then ibmasm_init_one() release all resources and return 0 on error path.

The patch adds corresponding error for fails.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@...ras.ru>
---
v2: change ibmasm_event_buffer_init() to return corresponding error and
 check return values as Andy Shevchenko suggested.
---
 drivers/misc/ibmasm/event.c  | 2 +-
 drivers/misc/ibmasm/module.c | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/ibmasm/event.c b/drivers/misc/ibmasm/event.c
index 8e540f4..7e33025 100644
--- a/drivers/misc/ibmasm/event.c
+++ b/drivers/misc/ibmasm/event.c
@@ -155,7 +155,7 @@ int ibmasm_event_buffer_init(struct service_processor *sp)
 
 	buffer = kmalloc(sizeof(struct event_buffer), GFP_KERNEL);
 	if (!buffer)
-		return 1;
+		return -ENOMEM;
 
 	buffer->next_index = 0;
 	buffer->next_serial_number = 1;
diff --git a/drivers/misc/ibmasm/module.c b/drivers/misc/ibmasm/module.c
index c5a456b..e914b8c 100644
--- a/drivers/misc/ibmasm/module.c
+++ b/drivers/misc/ibmasm/module.c
@@ -94,12 +94,14 @@ static int ibmasm_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	snprintf(sp->dirname, IBMASM_NAME_SIZE, "%d", sp->number);
 	snprintf(sp->devname, IBMASM_NAME_SIZE, "%s%d", DRIVER_NAME, sp->number);
 
-	if (ibmasm_event_buffer_init(sp)) {
+	result = ibmasm_event_buffer_init(sp);
+	if (result) {
 		dev_err(sp->dev, "Failed to allocate event buffer\n");
 		goto error_eventbuffer;
 	}
 
-	if (ibmasm_heartbeat_init(sp)) {
+	result = ibmasm_heartbeat_init(sp);
+	if (result) {
 		dev_err(sp->dev, "Failed to allocate heartbeat command\n");
 		goto error_heartbeat;
 	}
-- 
2.7.4