linux-kernel - [PATCH 4.15 003/122] ipmi_si: Fix error handling of platform device

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Date:   Wed,  7 Mar 2018 11:36:55 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Binderman <dcb314@...mail.com>,
        Corey Minyard <cminyard@...sta.com>
Subject: [PATCH 4.15 003/122] ipmi_si: Fix error handling of platform device

4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Corey Minyard <cminyard@...sta.com>

commit 174134ac760275457bb0d1560a0dbe6cf8a12ad6 upstream.

Cleanup of platform devices created by the IPMI driver was not
being done correctly and could result in a memory leak.  So
create a local boolean to know how to clean up those platform
devices.

Reported-by: David Binderman <dcb314@...mail.com>
Signed-off-by: Corey Minyard <cminyard@...sta.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/char/ipmi/ipmi_si_intf.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2045,6 +2045,7 @@ static int try_smi_init(struct smi_info
 	int rv = 0;
 	int i;
 	char *init_name = NULL;
+	bool platform_device_registered = false;
 
 	pr_info(PFX "Trying %s-specified %s state machine at %s address 0x%lx, slave address 0x%x, irq %d\n",
 		ipmi_addr_src_to_str(new_smi->io.addr_source),
@@ -2173,6 +2174,7 @@ static int try_smi_init(struct smi_info
 				rv);
 			goto out_err;
 		}
+		platform_device_registered = true;
 	}
 
 	dev_set_drvdata(new_smi->io.dev, new_smi);
@@ -2279,10 +2281,11 @@ out_err:
 	}
 
 	if (new_smi->pdev) {
-		platform_device_unregister(new_smi->pdev);
+		if (platform_device_registered)
+			platform_device_unregister(new_smi->pdev);
+		else
+			platform_device_put(new_smi->pdev);
 		new_smi->pdev = NULL;
-	} else if (new_smi->pdev) {
-		platform_device_put(new_smi->pdev);
 	}
 
 	kfree(init_name);