linux-kernel - [PATCH] tegra-hsp: fix a missing-check bug in tegra_hsp_doorbell

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Date:   Thu, 30 May 2019 09:19:20 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     jassisinghbrar@...il.com
Cc:     thierry.reding@...il.com, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: [PATCH] tegra-hsp: fix a missing-check bug in
 tegra_hsp_doorbell_create()

In tegra_hsp_doorbell_create(), 'db->name' is allocated by 
devm_kstrdup_const(). It returns NULL when fails. So 'db->name' should
be checked.

Signed-off-by: Gen Zhang <blackgod016574@...il.com>
Acked-by: Thierry Reding <treding@...dia.com>
---
diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
index 11fc9fd..b613c46 100644
--- a/drivers/mailbox/tegra-hsp.c
+++ b/drivers/mailbox/tegra-hsp.c
@@ -292,6 +292,8 @@ tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
 	db->channel.hsp = hsp;
 
 	db->name = devm_kstrdup_const(hsp->dev, name, GFP_KERNEL);
+	if (!db->name)
+		return ERR_PTR(-ENOMEM);
 	db->master = master;
 	db->index = index;
 
---