FreeCalypso > hg > fc-magnetite

view src/gpf2/osl/os_drv.c @ 516:1ed9de6c90bd

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
src/g23m-gsm/sms/sms_for.c: bogus malloc removed The new error handling code that was not present in TCS211 blob version contains a malloc call that is bogus for 3 reasons: 1) The memory allocation in question is not needed in the first place; 2) libc malloc is used instead of one of the firmware's proper ways; 3) The memory allocation is made inside a function and then never freed, i.e., a memory leak. This bug was caught in gcc-built FreeCalypso fw projects (Citrine and Selenite) because our gcc environment does not allow any use of libc malloc (any reference to malloc produces a link failure), but this code from TCS3.2 is wrong even for Magnetite: if this code path is executed repeatedly over a long time, the many small allocations made by this malloc call without a subsequent free will eventually exhaust the malloc heap provided by the TMS470 environment, malloc will start returning NULL, and the bogus code will treat it as an error. Because the memory allocation in question is not needed at all, the fix entails simply removing it.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 22 Jul 2018 06:04:49 +0000
parents 045d641c9bfa
children
line wrap: on
line source

/*
 * This C module is a reconstruction based on the disassembly of
 * os_drv.obj in frame_na7_db_fl.lib from the Leonardo package.
 */

/* set of included headers from COFF symtab: */
#include "nucleus.h"
#include "typedefs.h"
#include "gdi.h"
#include "os.h"

typedef unsigned char u_char;

extern OS_HANDLE os_ext_pool_handle;

static u_char *HISR_Stack;
static T_DRV_SIGNAL *SignalID;
static void (*DrvCallback)(T_DRV_SIGNAL *);
static NU_HISR CallBack_HISR;

#define	CB_HISR_STACK_SIZE	1024

GLOBAL LONG
os_ExecuteCallback(OS_HANDLE Caller, void (*Callback)(T_DRV_SIGNAL *),
			T_DRV_SIGNAL *Signal)
{
	DrvCallback = Callback;
	SignalID = Signal;
	NU_Activate_HISR(&CallBack_HISR);
	return(OS_OK);
}

static void
CallbackFunc(void)
{
	DrvCallback(SignalID);
}

GLOBAL LONG
os_CreateCallback(void)
{
	if (os_AllocateMemory(OS_NOTASK, (T_VOID_STRUCT **) &HISR_Stack,
				CB_HISR_STACK_SIZE, 0xFFFFFFFF,
				os_ext_pool_handle) == OS_ERROR)
		return(OS_ERROR);
	if (NU_Create_HISR(&CallBack_HISR, "CB_HISR", CallbackFunc, 2,
				HISR_Stack, CB_HISR_STACK_SIZE) == NU_SUCCESS)
		return(OS_OK);
	else
		return(OS_ERROR);
}