Signed-off-by: Richard Kuo <rkuo@xxxxxxxxxxxxxx>
---
arch/hexagon/kernel/signal.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/hexagon/kernel/signal.c b/arch/hexagon/kernel/signal.c
index 8a20e8e..097623c 100644
--- a/arch/hexagon/kernel/signal.c
+++ b/arch/hexagon/kernel/signal.c
@@ -41,6 +41,10 @@ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
{
unsigned long sp = regs->r29;
+ /* check if we would overflow the alt stack */
+ if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
+ return (void __user __force *)-1UL;
+
/* Switch to signal stack if appropriate */
if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
sp = current->sas_ss_sp + current->sas_ss_size;
--
1.7.9.5
--
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