linux-kernel - [PATCH] Drivers: hv: vmbus: Call hv_synic_free() if hv_synic

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Date:   Thu,  4 May 2023 15:41:55 -0700
From:   Dexuan Cui <decui@...rosoft.com>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
        linux-hyperv@...r.kernel.org, mikelley@...rosoft.com
Cc:     linux-kernel@...r.kernel.org, Dexuan Cui <decui@...rosoft.com>,
        stable@...nel.org
Subject: [PATCH] Drivers: hv: vmbus: Call hv_synic_free() if hv_synic_alloc() fails

Commit 572086325ce9 ("Drivers: hv: vmbus: Cleanup synic memory free path")
says "Any memory allocations that succeeded will be freed when the caller
cleans up by calling hv_synic_free()", but if the get_zeroed_page() in
hv_synic_alloc() fails, currently hv_synic_free() is not really called
in vmbus_bus_init(), consequently there will be a memory lead, e.g.
hv_context.hv_numa_map is not freed in the error path. Fix this by
updating the goto lables.

Cc: stable@...nel.org
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
---
 drivers/hv/vmbus_drv.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 59eb5fad12e7..c41e6ad0cf64 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1525,7 +1525,7 @@ static int vmbus_bus_init(void)
 	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hyperv/vmbus:online",
 				hv_synic_init, hv_synic_cleanup);
 	if (ret < 0)
-		goto err_cpuhp;
+		goto err_alloc;
 	hyperv_cpuhp_online = ret;
 
 	ret = vmbus_connect();
@@ -1577,9 +1577,8 @@ static int vmbus_bus_init(void)
 
 err_connect:
 	cpuhp_remove_state(hyperv_cpuhp_online);
-err_cpuhp:
-	hv_synic_free();
 err_alloc:
+	hv_synic_free();
 	if (vmbus_irq == -1) {
 		hv_remove_vmbus_handler();
 	} else {
-- 
2.25.1