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From:   Rafael Mendonca <rafaelmendsr@gmail.com>
To:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>,
        Sudeep Holla <sudeep.holla@arm.com>
Cc:     Rafael Mendonca <rafaelmendsr@gmail.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] ACPI: PCC: Release resources on address space setup failure path
Date:   Fri,  9 Sep 2022 12:33:19 -0300
Message-Id: <20220909153320.501347-1-rafaelmendsr@gmail.com>
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The allocated memory for the pcc_data struct doesn't get freed under an
error path in pcc_mbox_request_channel() or acpi_os_ioremap(). Also, the
PCC mailbox channel doesn't get freed under an error path in
acpi_os_ioremap().

Fixes: 77e2a04745ff8 ("ACPI: PCC: Implement OperationRegion handler for the PCC Type 3 subtype")
Signed-off-by: Rafael Mendonca <rafaelmendsr@gmail.com>
---
v1->v2
- Add PCC mailbox channel release to the unwind path 
- Update commit msg to reflect the addition of the mailbox free
---
 drivers/acpi/acpi_pcc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/acpi_pcc.c b/drivers/acpi/acpi_pcc.c
index a12b55d81209..84f1ac416b57 100644
--- a/drivers/acpi/acpi_pcc.c
+++ b/drivers/acpi/acpi_pcc.c
@@ -63,6 +63,7 @@ acpi_pcc_address_space_setup(acpi_handle region_handle, u32 function,
 	if (IS_ERR(data->pcc_chan)) {
 		pr_err("Failed to find PCC channel for subspace %d\n",
 		       ctx->subspace_id);
+		kfree(data);
 		return AE_NOT_FOUND;
 	}
 
@@ -72,6 +73,8 @@ acpi_pcc_address_space_setup(acpi_handle region_handle, u32 function,
 	if (!data->pcc_comm_addr) {
 		pr_err("Failed to ioremap PCC comm region mem for %d\n",
 		       ctx->subspace_id);
+		pcc_mbox_free_channel(data->pcc_chan);
+		kfree(data);
 		return AE_NO_MEMORY;
 	}
 
-- 
2.34.1