[PATCH urgent 2/2] x86/vm86: Set thread.vm86 to NULL on fork/clone

From: Andy Lutomirski
Date: Sat Oct 31 2015 - 01:43:03 EST

thread.vm86 points to per-task information -- the pointer should not
be copied on clone.

Fixes: d4ce0f26c790 ("x86/vm86: Move fields from 'struct kernel_vm86_struct' to 'struct vm86'")
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
arch/x86/kernel/process.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 2199d9b774c8..b9ac5434e176 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -83,6 +83,9 @@ EXPORT_SYMBOL_GPL(idle_notifier_unregister);
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
memcpy(dst, src, arch_task_struct_size);
+#ifdef CONFIG_VM86
+ dst->thread.vm86 = NULL;

return fpu__copy(&dst->thread.fpu, &src->thread.fpu);

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