[PATCH v4.1] ACPI / APEI: release resources if gen_pool_add fails

[Borislav Petkov <bp@alien8.de>]

Hi,

here's v4.1 with the labels properly balanced.

Thx.

---
From: Liguang Zhang <zhangliguang@linux.alibaba.com>
Date: Mon, 15 Jul 2019 14:58:44 +0800
Subject: [PATCH] ACPI / APEI: Release resources if gen_pool_add() fails

Destroy ghes_estatus_pool and release memory allocated via vmalloc() on
errors in ghes_estatus_pool_init() in order to avoid memory leaks.

 [ bp: do the labels properly and with descriptive names and massage. ]

Signed-off-by: Liguang Zhang <zhangliguang@linux.alibaba.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: James Morse <james.morse@arm.com>
Cc: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org
Cc: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/1563173924-47479-1-git-send-email-zhangliguang@linux.alibaba.com
---
 drivers/acpi/apei/ghes.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index a66e00fe31fe..66205ec54555 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -153,6 +153,7 @@ 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;
 
 	ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
 	if (!ghes_estatus_pool)
@@ -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 err_pool_alloc;
 
 	/*
 	 * New allocation must be visible in all pgd before it can be found by
@@ -172,7 +173,19 @@ 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 err_pool_add;
+
+	return 0;
+
+err_pool_add:
+	vfree((void *)addr);
+
+err_pool_alloc:
+	gen_pool_destroy(ghes_estatus_pool);
+
+	return -ENOMEM;
 }
 
 static int map_gen_v2(struct ghes *ghes)
-- 
2.21.0


-- 
Regards/Gruss,
    Boris.

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