[PATCH v4] ACPI / APEI: release resources if gen_pool_add fails

[luanshi <zhangliguang@linux.alibaba.com>]

To avoid memory leaks, destroy ghes_estatus_pool and release memory
allocated via vmalloc() on errors in ghes_estatus_pool_init().

Signed-off-by: Liguang Zhang <zhangliguang@linux.alibaba.com>
---
 drivers/acpi/apei/ghes.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index a66e00f..6d42ae1 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -153,10 +153,11 @@ static void ghes_unmap(void __iomem *vaddr, enum fixed_addresses fixmap_idx)
 int ghes_estatus_pool_init(int num_ghes)
 {
 	unsigned long addr, len;
+	int rc = 0;
 
 	ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
 	if (!ghes_estatus_pool)
-		return -ENOMEM;
+		goto nomem;
 
 	len = GHES_ESTATUS_CACHE_AVG_SIZE * GHES_ESTATUS_CACHE_ALLOCED_MAX;
 	len += (num_ghes * GHES_ESOURCE_PREALLOC_MAX_SIZE);
@@ -164,7 +165,7 @@ int ghes_estatus_pool_init(int num_ghes)
 	ghes_estatus_pool_size_request = PAGE_ALIGN(len);
 	addr = (unsigned long)vmalloc(PAGE_ALIGN(len));
 	if (!addr)
-		return -ENOMEM;
+		goto pool_destroy;
 
 	/*
 	 * New allocation must be visible in all pgd before it can be found by
@@ -172,7 +173,17 @@ int ghes_estatus_pool_init(int num_ghes)
 	 */
 	vmalloc_sync_all();
 
-	return gen_pool_add(ghes_estatus_pool, addr, PAGE_ALIGN(len), -1);
+	rc = gen_pool_add(ghes_estatus_pool, addr, PAGE_ALIGN(len), -1);
+	if (rc)
+		goto pool_destroy;
+	return 0;
+
+pool_destroy:
+	gen_pool_destroy(ghes_estatus_pool);
+	if (addr)
+		vfree((void *)addr);
+nomem:
+	return -ENOMEM;
 }
 
 static int map_gen_v2(struct ghes *ghes)
-- 
1.8.3.1