linux-kernel - [PATCH 1/1] platform/x86/intel: Fix uninitialized entry in pmt_crashlog

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Date:   Wed,  8 Jun 2022 09:17:12 +0800
From:   Xiaohui Zhang <xiaohuizhang@....edu.cn>
To:     Xiaohui Zhang <xiaohuizhang@....edu.cn>,
        "David E . Box" <david.e.box@...ux.intel.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <markgross@...nel.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] platform/x86/intel: Fix uninitialized entry in pmt_crashlog_probe

Similar to the handling of pmt_telem_probe in commit 2cdfa0c20d58
("platform/x86/intel: Fix 'rmmod pmt_telemetry' panic"), we thought
a patch might be needed here as well.

The probe function, pmt_crashlog_probe(), adds an entry for devices even if
they have not been initialized.  This results in the array of initialized
devices containing both initialized and uninitialized entries.  This
causes a panic in the remove function, pmt_crashlog_remove() which expects
the array to only contain initialized entries.

Only use an entry when a device is initialized.

Signed-off-by: Xiaohui Zhang <xiaohuizhang@....edu.cn>
---
 drivers/platform/x86/intel/pmt/crashlog.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel/pmt/crashlog.c b/drivers/platform/x86/intel/pmt/crashlog.c
index 34daf9df168b..ace1239bc0a0 100644
--- a/drivers/platform/x86/intel/pmt/crashlog.c
+++ b/drivers/platform/x86/intel/pmt/crashlog.c
@@ -282,7 +282,7 @@ static int pmt_crashlog_probe(struct auxiliary_device *auxdev,
 	auxiliary_set_drvdata(auxdev, priv);

 	for (i = 0; i < intel_vsec_dev->num_resources; i++) {
-		struct intel_pmt_entry *entry = &priv->entry[i].entry;
+		struct intel_pmt_entry *entry = &priv->entry[priv->num_entries].entry;

 		ret = intel_pmt_dev_create(entry, &pmt_crashlog_ns, intel_vsec_dev, i);
 		if (ret < 0)
-- 
2.17.1