sparc64: Tighten checks in kstack_valid().



The kernel stack pointer is invalid if it is not 16-byte
aligned.

Based upon a report by Meelis Roos <mroos@linux.ee>

Signed-off-by: David S. Miller <davem@davemloft.net>

parent 440ab7ac

arch/sparc/kernel/kstack.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -11,6 +11,10 @@ static inline bool kstack_valid(struct thread_info *tp, unsigned long sp)
		{
		unsigned long base = (unsigned long) tp;

		/* Stack pointer must be 16-byte aligned. */
		if (sp & (16UL - 1))
		return false;

		if (sp >= (base + sizeof(struct thread_info)) &&
		sp <= (base + THREAD_SIZE - sizeof(struct sparc_stackf)))
		return true;