From 8cae5c147f31c634cead34ea11359635b4888693 Mon Sep 17 00:00:00 2001 From: "mbbill@gmail.com" Date: Fri, 10 Jun 2011 06:04:06 +0000 Subject: [PATCH] fix mailbox offset overflow git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1486 bbd45198-f89e-11dd-88c7-29a3b14d5316 --- src/ipc.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/src/ipc.c b/src/ipc.c index cc09d8cd31..762d6e6d9c 100644 --- a/src/ipc.c +++ b/src/ipc.c @@ -1278,7 +1278,7 @@ rt_mailbox_t rt_mb_create (const char* name, rt_size_t size, rt_uint8_t flag) * @return the error code */ rt_err_t rt_mb_delete (rt_mailbox_t mb) -{ +{ /* parameter check */ RT_ASSERT(mb != RT_NULL); @@ -1398,7 +1398,7 @@ rt_err_t rt_mb_send_wait (rt_mailbox_t mb, rt_uint32_t value, rt_int32_t timeout mb->msg_pool[mb->in_offset] = value; /* increase input offset */ ++ mb->in_offset; - if (mb->in_offset > mb->size) mb->in_offset = 0; + if (mb->in_offset >= mb->size) mb->in_offset = 0; /* increase message entry */ mb->entry ++; @@ -1529,7 +1529,7 @@ rt_err_t rt_mb_recv (rt_mailbox_t mb, rt_uint32_t* value, rt_int32_t timeout) /* increase output offset */ ++mb->out_offset; - if (mb->out_offset > mb->size) mb->out_offset = 0; + if (mb->out_offset >= mb->size) mb->out_offset = 0; /* decrease message entry */ mb->entry --; -- GitLab