From: Helge Deller <deller@gmx.de>
Date: Sat, 8 Jul 2017 21:25:14 +0000 (+0200)
Subject: parisc: Disable further stack checks when panic occurs during stack check
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5bc64bd246ca00e0bb0b7137afaf586f2f66a911;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

parisc: Disable further stack checks when panic occurs during stack check

Before the irq handler detects a low stack and then panics the kernel, disable
further stack checks to avoid recursive panics.

Reported-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>
---

diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index ba5e1c7b1f17..5404e4086cb9 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -413,6 +413,10 @@ static inline void stack_overflow_check(struct pt_regs *regs)
 	if (regs->sr[7])
 		return;
 
+	/* exit if already in panic */
+	if (sysctl_panic_on_stackoverflow < 0)
+		return;
+
 	/* calculate kernel stack usage */
 	stack_usage = sp - stack_start;
 #ifdef CONFIG_IRQSTACKS
@@ -454,8 +458,10 @@ check_kernel_stack:
 #ifdef CONFIG_IRQSTACKS
 panic_check:
 #endif
-	if (sysctl_panic_on_stackoverflow)
+	if (sysctl_panic_on_stackoverflow) {
+		sysctl_panic_on_stackoverflow = -1; /* disable further checks */
 		panic("low stack detected by irq handler - check messages\n");
+	}
 #endif
 }