linux-kernel - [PATCH] EDAC: highbank: Fix memory leak in highbank_mc

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Message-Id: <20221229054825.1361993-1-linmq006@gmail.com>
Date:   Thu, 29 Dec 2022 09:48:24 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Andre Przywara <andre.przywara@....com>,
        Borislav Petkov <bp@...en8.de>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Richter <rric@...nel.org>,
        Rob Herring <rob.herring@...xeda.com>,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] EDAC: highbank: Fix memory leak in highbank_mc_probe

edac_mc_alloc() allocates memory. The memory are not released
when devres_open_group() fails, which causes memory leak.
Call edac_mc_free() in the error handling to fix this.

Fixes: a1b01edb2745 ("edac: add support for Calxeda highbank memory controller")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
altr_sdram_probe() performs similar operations,
I take it as reference.
---
 drivers/edac/highbank_mc_edac.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/edac/highbank_mc_edac.c b/drivers/edac/highbank_mc_edac.c
index 61b76ec226af..19fba258ae10 100644
--- a/drivers/edac/highbank_mc_edac.c
+++ b/drivers/edac/highbank_mc_edac.c
@@ -174,8 +174,10 @@ static int highbank_mc_probe(struct platform_device *pdev)
 	drvdata = mci->pvt_info;
 	platform_set_drvdata(pdev, mci);
 
-	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL))
-		return -ENOMEM;
+	if (!devres_open_group(&pdev->dev, NULL, GFP_KERNEL)) {
+		res = -ENOMEM;
+		goto free;
+	}
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r) {
@@ -243,6 +245,7 @@ static int highbank_mc_probe(struct platform_device *pdev)
 	edac_mc_del_mc(&pdev->dev);
 err:
 	devres_release_group(&pdev->dev, NULL);
+free:
 	edac_mc_free(mci);
 	return res;
 }
-- 
2.25.1