From: Paul Fertser <fercerpav@gmail.com>
Date: Wed, 14 Mar 2012 06:42:31 +0000 (+0300)
Subject: rtos: add sanity checking for FreeRTOS's quantity of priorities
X-Git-Tag: v0.6.0-rc1~181
X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=commitdiff_plain;h=e26d0761905930c326d4166349198ed8bc6af5ae

rtos: add sanity checking for FreeRTOS's quantity of priorities

On operating systems with opportunistic malloc() (e.g. default setting in
GNU/Linux) malloc can sometimes allocate a huge memory region but later the
process will get killed on the first attempt to use this memory, so
checking for malloc's return value is not enough to prevent a crash.

This patch is compile-tested only.

Change-Id: I5e21663115c8e9a0ca9f3d71f7ba4bd09e5c3bb1
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/521
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
---

diff --git a/src/rtos/FreeRTOS.c b/src/rtos/FreeRTOS.c
index 2c4791745b..a64626989e 100644
--- a/src/rtos/FreeRTOS.c
+++ b/src/rtos/FreeRTOS.c
@@ -30,6 +30,8 @@
 #include "helper/log.h"
 #include "rtos_standard_stackings.h"
 
+#define FREERTOS_MAX_PRIORITIES	63
+
 #define FreeRTOS_STRUCT(int_type, ptr_type, list_prev_offset)
 
 struct FreeRTOS_params {
@@ -220,6 +222,11 @@ static int FreeRTOS_update_threads(struct rtos *rtos)
 			(uint8_t *)&max_used_priority);
 	if (retval != ERROR_OK)
 		return retval;
+	if (max_used_priority > FREERTOS_MAX_PRIORITIES) {
+		LOG_ERROR("FreeRTOS maximum used priority is unreasonably big, not proceeding: %" PRId64 "",
+			max_used_priority);
+		return ERROR_FAIL;
+	}
 
 	symbol_address_t *list_of_lists =
 		(symbol_address_t *)malloc(sizeof(symbol_address_t) *