[Patch] vdso: check the value of vdso_enabled

[WANG Cong]

When the value of 'vdso_enabled' is out of range, make it default.

Signed-off-by: WANG Cong <wangcong@xxxxxxxxx>
Cc: mingo@xxxxxxxxxx

---
diff --git a/arch/x86/vdso/vdso32-setup.c b/arch/x86/vdso/vdso32-setup.c
index 0bce542..3428448 100644
--- a/arch/x86/vdso/vdso32-setup.c
+++ b/arch/x86/vdso/vdso32-setup.c
@@ -59,6 +59,8 @@ unsigned int __read_mostly vdso_enabled = VDSO_DEFAULT;
 static int __init vdso_setup(char *s)
 {
 	vdso_enabled = simple_strtoul(s, NULL, 0);
+	if (vdso_enabled > VDSO_COMPAT)
+		vdso_enabled = VDSO_DEFAULT;
 
 	return 1;
 }
--
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