linux-kernel - [PATCH] dlpar: Fix a missing-check bug in dlpar_parse_cc

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Date:   Thu, 30 May 2019 08:58:22 +0800
From:   Gen Zhang <blackgod016574@...il.com>
To:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dlpar: Fix a missing-check bug in dlpar_parse_cc_property()

In dlpar_parse_cc_property(), 'prop->name' is allocated by kstrdup().
kstrdup() may return NULL, so it should be checked and handle error.
And prop should be freed if 'prop->name' is NULL.

Signed-off-by: Gen Zhang <blackgod016574@...il.com>
Acked-by: Nathan Lynch <nathanl@...ux.ibm.com>
---
diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c
index 1795804..c852024 100644
--- a/arch/powerpc/platforms/pseries/dlpar.c
+++ b/arch/powerpc/platforms/pseries/dlpar.c
@@ -61,6 +61,10 @@ static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
 
 	name = (char *)ccwa + be32_to_cpu(ccwa->name_offset);
 	prop->name = kstrdup(name, GFP_KERNEL);
+	if (!prop->name) {
+		dlpar_free_cc_property(prop);
+		return NULL;
+	}
 
 	prop->length = be32_to_cpu(ccwa->prop_length);
 	value = (char *)ccwa + be32_to_cpu(ccwa->prop_offset);
---