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Fix mem leak with libusb by introducing buses/usbbus.c

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Now call only once usb_init(); usb_find_busses(); usb_find_devices()
instead of multiple calls in several scan() then open()

This fixes the following leaks:

==1159== 8 bytes in 1 blocks are definitely lost in loss record 9 of 102
==1159==    at 0x4C28BED: malloc (vg_replace_malloc.c:263)
==1159==    by 0x53D9931: usb_parse_configuration (in /lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4)
==1159==    by 0x53DB8B1: usb_os_find_devices (in /lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4)
==1159==    by 0x53D8FDC: usb_find_devices (in /lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4)
==1159==    by 0x4E41D79: pn53x_usb_scan (in /usr/lib/x86_64-linux-gnu/libnfc.so.4.0.0)
==1159==
==1159== 8 bytes in 1 blocks are definitely lost in loss record 10 of 102
==1159==    at 0x4C28BED: malloc (vg_replace_malloc.c:263)
==1159==    by 0x53D9931: usb_parse_configuration (in /lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4)
==1159==    by 0x53DB8B1: usb_os_find_devices (in /lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4)
==1159==    by 0x53D8FDC: usb_find_devices (in /lib/x86_64-linux-gnu/libusb-0.1.so.4.4.4)
==1159==    by 0x4E42CC7: pn53x_usb_open (in /usr/lib/x86_64-linux-gnu/libnfc.so.4.0.0)
==1159==    by 0x4E351E6: nfc_open (in /usr/lib/x86_64-linux-gnu/libnfc.so.4.0.0)
This commit is contained in:
Philippe Teuwen
2013-03-02 01:08:07 +01:00
parent 59227c3dd3
commit 9dcf7378b6
5 changed files with 120 additions and 97 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
libnfc/buses/Makefile.am
View File

@@ -3,7 +3,7 @@
AM_CPPFLAGS = $(all_includes) $(LIBNFC_CFLAGS)
noinst_LTLIBRARIES = libnfcbuses.la
libnfcbuses_la_SOURCES = uart.c uart.h
libnfcbuses_la_SOURCES = uart.c uart.h usbbus.c usbbus.h
libnfcbuses_la_CFLAGS = -I$(top_srcdir)/libnfc
EXTRA_DIST = uart_posix.c uart_win32.c

61
libnfc/buses/usbbus.c Normal file
View File

@@ -0,0 +1,61 @@
/*-
* Public platform independent Near Field Communication (NFC) library
*
* Copyright (C) 2013, Romuald Conty
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
/**
* @file usbbus.c
* @brief libusb 0.1 driver wrapper
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif // HAVE_CONFIG_H
#include "usbbus.h"
#include "log.h"
#define LOG_CATEGORY "libnfc.buses.usbbus"
#define LOG_GROUP NFC_LOG_GROUP_DRIVER
// Global flag to know if usb_init() has already been called or not
bool usb_initialized=false;
int usb_prepare(void) {
if (usb_initialized)
return 0;
usb_init();
usb_initialized = true;
int res;
// usb_find_busses will find all of the busses on the system. Returns the
// number of changes since previous call to this function (total of new
// busses and busses removed).
if ((res = usb_find_busses()) < 0) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "Unable to find USB busses (%s)", _usb_strerror(res));
return -1;
}
// usb_find_devices will find all of the devices on each bus. This should be
// called after usb_find_busses. Returns the number of changes since the
// previous call to this function (total of new device and devices removed).
if ((res = usb_find_devices()) < 0) {
log_put(LOG_GROUP, LOG_CATEGORY, NFC_LOG_PRIORITY_ERROR, "Unable to find USB devices (%s)", _usb_strerror(res));
return -1;
}
return 0;
}

49
libnfc/buses/usbbus.h Normal file
View File

@@ -0,0 +1,49 @@
/*-
* Public platform independent Near Field Communication (NFC) library
*
* Copyright (C) 2013, Romuald Conty
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
/**
* @file usbbus.h
* @brief libusb 0.1 driver header
*/
#ifndef __NFC_BUS_USB_H__
# define __NFC_BUS_USB_H__
#ifndef _WIN32
// Under POSIX system, we use libusb (>= 0.1.12)
#include <usb.h>
#define USB_TIMEDOUT ETIMEDOUT
#define _usb_strerror( X ) strerror(-X)
#else
// Under Windows we use libusb-win32 (>= 1.2.5)
#include <lusb0_usb.h>
#define USB_TIMEDOUT 116
#define _usb_strerror( X ) usb_strerror()
#endif
#include <stdbool.h>
#include <string.h>
// Global flag to know if usb_init() has already been called or not
extern bool usb_initialized;
int usb_prepare(void);
#endif // __NFC_BUS_USB_H__