linux-kernel - [PATCH] vdso: Fix memory leak of init_vdso

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Message-ID: <BANLkTikz+i6kahgoEAQPzoL9PVpywVb0ug@mail.gmail.com>
Date:	Wed, 18 May 2011 15:05:49 +0800
From:	wzt wzt <wzt.wzt@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, ak@...ux.intel.com, mingo@...hat.com,
	tglx@...utronix.de, hpa@...or.com
Subject: [PATCH] vdso: Fix memory leak of init_vdso_vars().

Fix memory leak of init_vdso_vars().

Signed-off-by: Zhitong Wang <zhitong.wangzt@...baba-inc.com>
Reviewed-by: Coly Li <bosong.ly@...bao.com>

---
 arch/x86/vdso/vma.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c
index 4b5d26f..8d9d652 100644
--- a/arch/x86/vdso/vma.c
+++ b/arch/x86/vdso/vma.c
@@ -44,19 +44,19 @@ static int __init init_vdso_vars(void)
 	vdso_size = npages << PAGE_SHIFT;
 	vdso_pages = kmalloc(sizeof(struct page *) * npages, GFP_KERNEL);
 	if (!vdso_pages)
-		goto oom;
+		goto oom1;
 	for (i = 0; i < npages; i++) {
 		struct page *p;
 		p = alloc_page(GFP_KERNEL);
 		if (!p)
-			goto oom;
+			goto oom2;
 		vdso_pages[i] = p;
 		copy_page(page_address(p), vdso_start + i*PAGE_SIZE);
 	}

 	vbase = vmap(vdso_pages, npages, 0, PAGE_KERNEL);
 	if (!vbase)
-		goto oom;
+		goto oom2;

 	if (memcmp(vbase, "\177ELF", 4)) {
 		printk("VDSO: I'm broken; not ELF\n");
@@ -70,7 +70,13 @@ static int __init init_vdso_vars(void)
 	vunmap(vbase);
 	return 0;

- oom:
+oom2:
+	i--;
+	for (; i >= 0; i--)
+		__free_page(vdso_pages[i]);
+oom1:
+	__free_page(vdso_pages);
+
 	printk("Cannot allocate vdso\n");
 	vdso_enabled = 0;
 	return -ENOMEM;
-- 
1.7.1

View attachment "0001-Fix-memory-leak-of-init_vdso_vars.patch" of type "text/x-patch" (1255 bytes)