linux-kernel - [PATCH] powerpc/powernv: Fix null pointer dereference in opal_powercap

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Date:   Sun, 26 Nov 2023 17:57:39 +0800
From:   Kunwu Chan <chentao@...inos.cn>
To:     mpe@...erman.id.au, npiggin@...il.com, christophe.leroy@...roup.eu,
        robh@...nel.org
Cc:     kunwu.chan@...mail.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Kunwu Chan <chentao@...inos.cn>
Subject: [PATCH] powerpc/powernv: Fix null pointer dereference in opal_powercap_init

kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure.

Fixes: b9ef7b4b867f ("powerpc: Convert to using %pOFn instead of device_node.name")
Signed-off-by: Kunwu Chan <chentao@...inos.cn>
---
 arch/powerpc/platforms/powernv/opal-powercap.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/opal-powercap.c b/arch/powerpc/platforms/powernv/opal-powercap.c
index 7bfe4cbeb35a..ea917266aa17 100644
--- a/arch/powerpc/platforms/powernv/opal-powercap.c
+++ b/arch/powerpc/platforms/powernv/opal-powercap.c
@@ -196,6 +196,12 @@ void __init opal_powercap_init(void)
 
 		j = 0;
 		pcaps[i].pg.name = kasprintf(GFP_KERNEL, "%pOFn", node);
+		if (!pcaps[i].pg.name) {
+			kfree(pcaps[i].pattrs);
+			kfree(pcaps[i].pg.attrs);
+			goto out_pcaps_pattrs;
+		}
+
 		if (has_min) {
 			powercap_add_attr(min, "powercap-min",
 					  &pcaps[i].pattrs[j]);
-- 
2.34.1