From: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Date: Thu, 22 Nov 2018 10:26:21 +0000 (+0100)
Subject: riscv: treat undefined exception codes as reserved
X-Git-Tag: v2019.01-rc1~26^2~20
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=e8b522b1df8b5874e08b53f6e5aef8a2c458446b;p=oweals%2Fu-boot.git

riscv: treat undefined exception codes as reserved

Undefined exception codes currently lead to an out-of-bounds array
access. Prevent this by treating undefined exception codes as
"reserved".

Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Rick Chen <rick@andestech.com>
---

diff --git a/arch/riscv/lib/interrupts.c b/arch/riscv/lib/interrupts.c
index 6a12818c2b..d0d8de500e 100644
--- a/arch/riscv/lib/interrupts.c
+++ b/arch/riscv/lib/interrupts.c
@@ -81,6 +81,10 @@ static void _exit_trap(ulong code, ulong epc, struct pt_regs *regs)
 		"Store/AMO page fault",
 	};
 
-	printf("exception code: %ld , %s , epc %lx , ra %lx\n",
-		code, exception_code[code], epc, regs->ra);
+	if (code < ARRAY_SIZE(exception_code)) {
+		printf("exception code: %ld , %s , epc %lx , ra %lx\n",
+		       code, exception_code[code], epc, regs->ra);
+	} else {
+		printf("Reserved\n");
+	}
 }