linux-kernel - [PATCH] stm: class: dummy_stm: fix an error code in dummy_stm

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Message-ID: <YFS5TWHDqL7nIBEv@mwanda>
Date:   Fri, 19 Mar 2021 17:46:37 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] stm: class: dummy_stm: fix an error code in dummy_stm_init()

If the kasprintf() allocation fails after the first iteration through
the loop then it returns success instead of -ENOMEM as intended.

Fixes: bcfdf8afdebe ("stm class: dummy_stm: Create multiple devices")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/hwtracing/stm/dummy_stm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/stm/dummy_stm.c b/drivers/hwtracing/stm/dummy_stm.c
index 38528ffdc0b3..36d32e7afb35 100644
--- a/drivers/hwtracing/stm/dummy_stm.c
+++ b/drivers/hwtracing/stm/dummy_stm.c
@@ -68,7 +68,7 @@ static int dummy_stm_link(struct stm_data *data, unsigned int master,
 
 static int dummy_stm_init(void)
 {
-	int i, ret = -ENOMEM;
+	int i, ret;
 
 	if (nr_dummies < 0 || nr_dummies > DUMMY_STM_MAX)
 		return -EINVAL;
@@ -80,8 +80,10 @@ static int dummy_stm_init(void)
 
 	for (i = 0; i < nr_dummies; i++) {
 		dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i);
-		if (!dummy_stm[i].name)
+		if (!dummy_stm[i].name) {
+			ret = -ENOMEM;
 			goto fail_unregister;
+		}
 
 		dummy_stm[i].sw_start		= master_min;
 		dummy_stm[i].sw_end		= master_max;
-- 
2.30.1