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ARM: 7913/1: fix framepointer check in unwind_frame
This patch fixes corner case when (fp + 4) overflows unsigned long, for example: fp = 0xFFFFFFFF -> fp + 4 == 3. Cc: <stable@vger.kernel.org> Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@samsung.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -31,7 +31,7 @@ int notrace unwind_frame(struct stackframe *frame)
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high = ALIGN(low, THREAD_SIZE);
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/* check current frame pointer is within bounds */
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if (fp < (low + 12) || fp + 4 >= high)
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if (fp < low + 12 || fp > high - 4)
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return -EINVAL;
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/* restore the registers from the stack frame */
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