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[1/6] powercap: intel_rapl: Fix a NULL pointer dereference bug

Message ID 20240131113713.74779-2-rui.zhang@intel.com
State Accepted
Commit 2d1f5006ff95770da502f8cee2a224a1ff83866e
Headers show
Series [1/6] powercap: intel_rapl: Fix a NULL pointer dereference bug | expand

Commit Message

Zhang, Rui Jan. 31, 2024, 11:37 a.m. UTC
A NULL pointer dereference bug is triggered when probing MMIO RAPL
driver on platforms with CPU ID not listed in intel_rapl_common CPU
model list.

This is because the intel_rapl_common module still probes on such
platforms even if 'defaults_msr' is not set after commit 1488ac990ac8
("powercap: intel_rapl: Allow probing without CPUID match"). Thus the
MMIO RAPL rp->priv->defaults is NULL when registering to RAPL framework.

Fix the problem by adding sanity check to ensure rp->priv->rapl_defaults
is always valid.

Fixes: 1488ac990ac8 ("powercap: intel_rapl: Allow probing without CPUID match")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Cc: <stable@vger.kernel.org>
---
 drivers/powercap/intel_rapl_common.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c
index 2feed036c1cd..1a739afd47d9 100644
--- a/drivers/powercap/intel_rapl_common.c
+++ b/drivers/powercap/intel_rapl_common.c
@@ -759,6 +759,11 @@  static int rapl_config(struct rapl_package *rp)
 	default:
 		return -EINVAL;
 	}
+
+	/* defaults_msr can be NULL on unsupported platforms */
+	if (!rp->priv->defaults || !rp->priv->rpi)
+		return -ENODEV;
+
 	return 0;
 }