linux-kernel - [PATCH] lib/test_kasan.c: Fix memory leak in kmalloc_oob_krealloc

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Message-ID: <20200123160115.GA4202@embeddedor>
Date:   Thu, 23 Jan 2020 10:01:15 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <adech.fo@...il.com>
Cc:     kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] lib/test_kasan.c: Fix memory leak in
 kmalloc_oob_krealloc_more()

In case memory resources for _ptr2_ were allocated, release them
before return.

Notice that in case _ptr1_ happens to be NULL, krealloc() behaves
exactly like kmalloc().

Addresses-Coverity-ID: 1490594 ("Resource leak")
Fixes: 3f15801cdc23 ("lib: add kasan test module")
Cc: stable@...r.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 lib/test_kasan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 328d33beae36..3872d250ed2c 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -158,6 +158,7 @@ static noinline void __init kmalloc_oob_krealloc_more(void)
 	if (!ptr1 || !ptr2) {
 		pr_err("Allocation failed\n");
 		kfree(ptr1);
+		kfree(ptr2);
 		return;
 	}
 
-- 
2.25.0