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RetroArch/libretro-db/rmsgpack.c
Higor Eurípedes 3ec31873e8 (rmsgpack.c) Fix possible double free() in rmsgpack_read() 
read_buff() didn't set *pbuff to NULL after on error.
2016-09-17 21:22:49 -03:00

661 lines
17 KiB
C
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/* Copyright (C) 2010-2016 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (rmsgpack.c).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdlib.h>
#ifdef _WIN32
#include <direct.h>
#else
#include <unistd.h>
#endif
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <retro_endianness.h>
#include "rmsgpack.h"
#define _MPF_FIXMAP 0x80
#define _MPF_MAP16 0xde
#define _MPF_MAP32 0xdf
#define _MPF_FIXARRAY 0x90
#define _MPF_ARRAY16 0xdc
#define _MPF_ARRAY32 0xdd
#define _MPF_FIXSTR 0xa0
#define _MPF_STR8 0xd9
#define _MPF_STR16 0xda
#define _MPF_STR32 0xdb
#define _MPF_BIN8 0xc4
#define _MPF_BIN16 0xc5
#define _MPF_BIN32 0xc6
#define _MPF_FALSE 0xc2
#define _MPF_TRUE 0xc3
#define _MPF_INT8 0xd0
#define _MPF_INT16 0xd1
#define _MPF_INT32 0xd2
#define _MPF_INT64 0xd3
#define _MPF_UINT8 0xcc
#define _MPF_UINT16 0xcd
#define _MPF_UINT32 0xce
#define _MPF_UINT64 0xcf
#define _MPF_NIL 0xc0
static const uint8_t MPF_FIXMAP = _MPF_FIXMAP;
static const uint8_t MPF_MAP16 = _MPF_MAP16;
static const uint8_t MPF_MAP32 = _MPF_MAP32;
static const uint8_t MPF_FIXARRAY = _MPF_FIXARRAY;
static const uint8_t MPF_ARRAY16 = _MPF_ARRAY16;
static const uint8_t MPF_ARRAY32 = _MPF_ARRAY32;
static const uint8_t MPF_FIXSTR = _MPF_FIXSTR;
static const uint8_t MPF_STR8 = _MPF_STR8;
static const uint8_t MPF_STR16 = _MPF_STR16;
static const uint8_t MPF_STR32 = _MPF_STR32;
static const uint8_t MPF_BIN8 = _MPF_BIN8;
static const uint8_t MPF_BIN16 = _MPF_BIN16;
static const uint8_t MPF_BIN32 = _MPF_BIN32;
static const uint8_t MPF_FALSE = _MPF_FALSE;
static const uint8_t MPF_TRUE = _MPF_TRUE;
static const uint8_t MPF_INT8 = _MPF_INT8;
static const uint8_t MPF_INT16 = _MPF_INT16;
static const uint8_t MPF_INT32 = _MPF_INT32;
static const uint8_t MPF_INT64 = _MPF_INT64;
static const uint8_t MPF_UINT8 = _MPF_UINT8;
static const uint8_t MPF_UINT16 = _MPF_UINT16;
static const uint8_t MPF_UINT32 = _MPF_UINT32;
static const uint8_t MPF_UINT64 = _MPF_UINT64;
static const uint8_t MPF_NIL = _MPF_NIL;
int rmsgpack_write_array_header(RFILE *fd, uint32_t size)
{
uint16_t tmp_i16;
uint32_t tmp_i32;
if (size < 16)
{
size = (size | MPF_FIXARRAY);
if (filestream_write(fd, &size, sizeof(int8_t)) == -1)
goto error;
return sizeof(int8_t);
}
else if (size == (uint16_t)size)
{
if (filestream_write(fd, &MPF_ARRAY16, sizeof(MPF_ARRAY16)) == -1)
goto error;
tmp_i16 = swap_if_little16(size);
if (filestream_write(fd, (void *)(&tmp_i16), sizeof(uint16_t)) == -1)
goto error;
return sizeof(int8_t) + sizeof(uint16_t);
}
if (filestream_write(fd, &MPF_ARRAY32, sizeof(MPF_ARRAY32)) == -1)
goto error;
tmp_i32 = swap_if_little32(size);
if (filestream_write(fd, (void *)(&tmp_i32), sizeof(uint32_t)) == -1)
goto error;
return sizeof(int8_t) + sizeof(uint32_t);
error:
return -errno;
}
int rmsgpack_write_map_header(RFILE *fd, uint32_t size)
{
uint16_t tmp_i16;
uint32_t tmp_i32;
if (size < 16)
{
size = (size | MPF_FIXMAP);
if (filestream_write(fd, &size, sizeof(int8_t)) == -1)
goto error;
return sizeof(int8_t);
}
else if (size < (uint16_t)size)
{
if (filestream_write(fd, &MPF_MAP16, sizeof(MPF_MAP16)) == -1)
goto error;
tmp_i16 = swap_if_little16(size);
if (filestream_write(fd, (void *)(&tmp_i16), sizeof(uint16_t)) == -1)
goto error;
return sizeof(uint8_t) + sizeof(uint16_t);
}
tmp_i32 = swap_if_little32(size);
if (filestream_write(fd, &MPF_MAP32, sizeof(MPF_MAP32)) == -1)
goto error;
if (filestream_write(fd, (void *)(&tmp_i32), sizeof(uint32_t)) == -1)
goto error;
return sizeof(int8_t) + sizeof(uint32_t);
error:
return -errno;
}
int rmsgpack_write_string(RFILE *fd, const char *s, uint32_t len)
{
uint16_t tmp_i16;
uint32_t tmp_i32;
int8_t fixlen = 0;
int written = sizeof(int8_t);
if (len < 32)
{
fixlen = len | MPF_FIXSTR;
if (filestream_write(fd, &fixlen, sizeof(int8_t)) == -1)
goto error;
}
else if (len < (1 << 8))
{
if (filestream_write(fd, &MPF_STR8, sizeof(MPF_STR8)) == -1)
goto error;
if (filestream_write(fd, &len, sizeof(uint8_t)) == -1)
goto error;
written += sizeof(uint8_t);
}
else if (len < (1 << 16))
{
if (filestream_write(fd, &MPF_STR16, sizeof(MPF_STR16)) == -1)
goto error;
tmp_i16 = swap_if_little16(len);
if (filestream_write(fd, &tmp_i16, sizeof(uint16_t)) == -1)
goto error;
written += sizeof(uint16_t);
}
else
{
if (filestream_write(fd, &MPF_STR32, sizeof(MPF_STR32)) == -1)
goto error;
tmp_i32 = swap_if_little32(len);
if (filestream_write(fd, &tmp_i32, sizeof(uint32_t)) == -1)
goto error;
written += sizeof(uint32_t);
}
if (filestream_write(fd, s, len) == -1)
goto error;
written += len;
return written;
error:
return -errno;
}
int rmsgpack_write_bin(RFILE *fd, const void *s, uint32_t len)
{
uint16_t tmp_i16;
uint32_t tmp_i32;
if (len == (uint8_t)len)
{
if (filestream_write(fd, &MPF_BIN8, sizeof(MPF_BIN8)) == -1)
goto error;
if (filestream_write(fd, &len, sizeof(uint8_t)) == -1)
goto error;
}
else if (len == (uint16_t)len)
{
if (filestream_write(fd, &MPF_BIN16, sizeof(MPF_BIN16)) == -1)
goto error;
tmp_i16 = swap_if_little16(len);
if (filestream_write(fd, &tmp_i16, sizeof(uint16_t)) == -1)
goto error;
}
else
{
if (filestream_write(fd, &MPF_BIN32, sizeof(MPF_BIN32)) == -1)
goto error;
tmp_i32 = swap_if_little32(len);
if (filestream_write(fd, &tmp_i32, sizeof(uint32_t)) == -1)
goto error;
}
if (filestream_write(fd, s, len) == -1)
goto error;
return 0;
error:
return -errno;
}
int rmsgpack_write_nil(RFILE *fd)
{
if (filestream_write(fd, &MPF_NIL, sizeof(MPF_NIL)) == -1)
return -errno;
return sizeof(uint8_t);
}
int rmsgpack_write_bool(RFILE *fd, int value)
{
if (value)
{
if (filestream_write(fd, &MPF_TRUE, sizeof(MPF_TRUE)) == -1)
goto error;
}
if (filestream_write(fd, &MPF_FALSE, sizeof(MPF_FALSE)) == -1)
goto error;
return sizeof(uint8_t);
error:
return -errno;
}
int rmsgpack_write_int(RFILE *fd, int64_t value)
{
int16_t tmp_i16;
int32_t tmp_i32;
uint8_t tmpval = 0;
int written = sizeof(uint8_t);
if (value >=0 && value < 128)
{
if (filestream_write(fd, &value, sizeof(int8_t)) == -1)
goto error;
}
else if (value < 0 && value > -32)
{
tmpval = (value) | 0xe0;
if (filestream_write(fd, &tmpval, sizeof(uint8_t)) == -1)
goto error;
}
else if (value == (int8_t)value)
{
if (filestream_write(fd, &MPF_INT8, sizeof(MPF_INT8)) == -1)
goto error;
if (filestream_write(fd, &value, sizeof(int8_t)) == -1)
goto error;
written += sizeof(int8_t);
}
else if (value == (int16_t)value)
{
if (filestream_write(fd, &MPF_INT16, sizeof(MPF_INT16)) == -1)
goto error;
tmp_i16 = swap_if_little16((uint16_t)value);
if (filestream_write(fd, &tmp_i16, sizeof(int16_t)) == -1)
goto error;
written += sizeof(int16_t);
}
else if (value == (int32_t)value)
{
if (filestream_write(fd, &MPF_INT32, sizeof(MPF_INT32)) == -1)
goto error;
tmp_i32 = swap_if_little32((uint32_t)value);
if (filestream_write(fd, &tmp_i32, sizeof(int32_t)) == -1)
goto error;
written += sizeof(int32_t);
}
else
{
if (filestream_write(fd, &MPF_INT64, sizeof(MPF_INT64)) == -1)
goto error;
value = swap_if_little64(value);
if (filestream_write(fd, &value, sizeof(int64_t)) == -1)
goto error;
written += sizeof(int64_t);
}
return written;
error:
return -errno;
}
int rmsgpack_write_uint(RFILE *fd, uint64_t value)
{
uint16_t tmp_i16;
uint32_t tmp_i32;
int written = sizeof(uint8_t);
if (value == (uint8_t)value)
{
if (filestream_write(fd, &MPF_UINT8, sizeof(MPF_UINT8)) == -1)
goto error;
if (filestream_write(fd, &value, sizeof(uint8_t)) == -1)
goto error;
written += sizeof(uint8_t);
}
else if (value == (uint16_t)value)
{
if (filestream_write(fd, &MPF_UINT16, sizeof(MPF_UINT16)) == -1)
goto error;
tmp_i16 = swap_if_little16((uint16_t)value);
if (filestream_write(fd, &tmp_i16, sizeof(uint16_t)) == -1)
goto error;
written += sizeof(uint16_t);
}
else if (value == (uint32_t)value)
{
if (filestream_write(fd, &MPF_UINT32, sizeof(MPF_UINT32)) == -1)
goto error;
tmp_i32 = swap_if_little32((uint32_t)value);
if (filestream_write(fd, &tmp_i32, sizeof(uint32_t)) == -1)
goto error;
written += sizeof(uint32_t);
}
else
{
if (filestream_write(fd, &MPF_UINT64, sizeof(MPF_UINT64)) == -1)
goto error;
value = swap_if_little64(value);
if (filestream_write(fd, &value, sizeof(uint64_t)) == -1)
goto error;
written += sizeof(uint64_t);
}
return written;
error:
return -errno;
}
static int read_uint(RFILE *fd, uint64_t *out, size_t size)
{
uint64_t tmp;
if (filestream_read(fd, &tmp, size) == -1)
goto error;
switch (size)
{
case 1:
*out = *(uint8_t *)(&tmp);
break;
case 2:
*out = swap_if_little16((uint16_t)tmp);
break;
case 4:
*out = swap_if_little32((uint32_t)tmp);
break;
case 8:
*out = swap_if_little64(tmp);
break;
}
return 0;
error:
return -errno;
}
static int read_int(RFILE *fd, int64_t *out, size_t size)
{
uint8_t tmp8 = 0;
uint16_t tmp16;
uint32_t tmp32;
uint64_t tmp64;
if (filestream_read(fd, &tmp64, size) == -1)
goto error;
(void)tmp8;
switch (size)
{
case 1:
*out = *((int8_t *)(&tmp64));
break;
case 2:
tmp16 = swap_if_little16((uint16_t)tmp64);
*out = *((int16_t *)(&tmp16));
break;
case 4:
tmp32 = swap_if_little32((uint32_t)tmp64);
*out = *((int32_t *)(&tmp32));
break;
case 8:
tmp64 = swap_if_little64(tmp64);
*out = *((int64_t *)(&tmp64));
break;
}
return 0;
error:
return -errno;
}
static int read_buff(RFILE *fd, size_t size, char **pbuff, uint64_t *len)
{
uint64_t tmp_len = 0;
ssize_t read_len = 0;
if (read_uint(fd, &tmp_len, size) == -1)
return -errno;
*pbuff = (char *)malloc((size_t)(tmp_len + 1) * sizeof(char));
if ((read_len = filestream_read(fd, *pbuff, (size_t)tmp_len)) == -1)
goto error;
*len = read_len;
(*pbuff)[read_len] = 0;
/* Throw warning on read_len != tmp_len ? */
return 0;
error:
free(*pbuff);
*pbuff = NULL;
return -errno;
}
static int read_map(RFILE *fd, uint32_t len,
struct rmsgpack_read_callbacks *callbacks, void *data)
{
int rv;
unsigned i;
if (callbacks->read_map_start &&
(rv = callbacks->read_map_start(len, data)) < 0)
return rv;
for (i = 0; i < len; i++)
{
if ((rv = rmsgpack_read(fd, callbacks, data)) < 0)
return rv;
if ((rv = rmsgpack_read(fd, callbacks, data)) < 0)
return rv;
}
return 0;
}
static int read_array(RFILE *fd, uint32_t len,
struct rmsgpack_read_callbacks *callbacks, void *data)
{
int rv;
unsigned i;
if (callbacks->read_array_start &&
(rv = callbacks->read_array_start(len, data)) < 0)
return rv;
for (i = 0; i < len; i++)
{
if ((rv = rmsgpack_read(fd, callbacks, data)) < 0)
return rv;
}
return 0;
}
int rmsgpack_read(RFILE *fd,
struct rmsgpack_read_callbacks *callbacks, void *data)
{
int rv;
uint64_t tmp_len = 0;
uint64_t tmp_uint = 0;
int64_t tmp_int = 0;
uint8_t type = 0;
char *buff = NULL;
if (filestream_read(fd, &type, sizeof(uint8_t)) == -1)
goto error;
if (type < MPF_FIXMAP)
{
if (!callbacks->read_int)
return 0;
return callbacks->read_int(type, data);
}
else if (type < MPF_FIXARRAY)
{
tmp_len = type - MPF_FIXMAP;
return read_map(fd, (uint32_t)tmp_len, callbacks, data);
}
else if (type < MPF_FIXSTR)
{
tmp_len = type - MPF_FIXARRAY;
return read_array(fd, (uint32_t)tmp_len, callbacks, data);
}
else if (type < MPF_NIL)
{
ssize_t read_len = 0;
tmp_len = type - MPF_FIXSTR;
buff = (char *)malloc((size_t)(tmp_len + 1) * sizeof(char));
if (!buff)
return -ENOMEM;
if ((read_len = filestream_read(fd, buff, (ssize_t)tmp_len)) == -1)
{
free(buff);
goto error;
}
buff[read_len] = '\0';
if (!callbacks->read_string)
{
free(buff);
return 0;
}
return callbacks->read_string(buff, (uint32_t)read_len, data);
}
else if (type > MPF_MAP32)
{
if (!callbacks->read_int)
return 0;
return callbacks->read_int(type - 0xff - 1, data);
}
switch (type)
{
case _MPF_NIL:
if (callbacks->read_nil)
return callbacks->read_nil(data);
break;
case _MPF_FALSE:
if (callbacks->read_bool)
return callbacks->read_bool(0, data);
break;
case _MPF_TRUE:
if (callbacks->read_bool)
return callbacks->read_bool(1, data);
break;
case _MPF_BIN8:
case _MPF_BIN16:
case _MPF_BIN32:
if ((rv = read_buff(fd, 1<<(type - _MPF_BIN8),
&buff, &tmp_len)) < 0)
return rv;
if (callbacks->read_bin)
return callbacks->read_bin(buff, (uint32_t)tmp_len, data);
break;
case _MPF_UINT8:
case _MPF_UINT16:
case _MPF_UINT32:
case _MPF_UINT64:
tmp_len = UINT64_C(1) << (type - _MPF_UINT8);
tmp_uint = 0;
if (read_uint(fd, &tmp_uint, (size_t)tmp_len) == -1)
goto error;
if (callbacks->read_uint)
return callbacks->read_uint(tmp_uint, data);
break;
case _MPF_INT8:
case _MPF_INT16:
case _MPF_INT32:
case _MPF_INT64:
tmp_len = UINT64_C(1) << (type - _MPF_INT8);
tmp_int = 0;
if (read_int(fd, &tmp_int, (size_t)tmp_len) == -1)
goto error;
if (callbacks->read_int)
return callbacks->read_int(tmp_int, data);
break;
case _MPF_STR8:
case _MPF_STR16:
case _MPF_STR32:
if ((rv = read_buff(fd, 1<<(type - _MPF_STR8), &buff, &tmp_len)) < 0)
return rv;
if (callbacks->read_string)
return callbacks->read_string(buff, (uint32_t)tmp_len, data);
break;
case _MPF_ARRAY16:
case _MPF_ARRAY32:
if (read_uint(fd, &tmp_len, 2<<(type - _MPF_ARRAY16)) == -1)
goto error;
return read_array(fd, (uint32_t)tmp_len, callbacks, data);
case _MPF_MAP16:
case _MPF_MAP32:
if (read_uint(fd, &tmp_len, 2<<(type - _MPF_MAP16)) == -1)
goto error;
return read_map(fd, (uint32_t)tmp_len, callbacks, data);
}
if (buff)
free(buff);
return 0;
error:
return -errno;
}
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