aboutsummaryrefslogtreecommitdiff
path: root/lib/lzo/lzo1x_decompress_safe.c
blob: a1c387f6afba24c3a027456b48b44c603c3c3b96 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
/*
 *  LZO1X Decompressor from LZO
 *
 *  Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
 *
 *  The full LZO package can be found at:
 *  http://www.oberhumer.com/opensource/lzo/
 *
 *  Changed for Linux kernel use by:
 *  Nitin Gupta <nitingupta910@gmail.com>
 *  Richard Purdie <rpurdie@openedhand.com>
 */

#ifndef STATIC
#include <linux/module.h>
#include <linux/kernel.h>
#endif
#include <asm/unaligned.h>
#include <linux/lzo.h>
#include "lzodefs.h"

#define HAVE_IP(x)      ((size_t)(ip_end - ip) >= (size_t)(x))
#define HAVE_OP(x)      ((size_t)(op_end - op) >= (size_t)(x))
#define NEED_IP(x)      if (!HAVE_IP(x)) goto input_overrun
#define NEED_OP(x)      if (!HAVE_OP(x)) goto output_overrun
#define TEST_LB(m_pos)  if ((m_pos) < out) goto lookbehind_overrun

/* This MAX_255_COUNT is the maximum number of times we can add 255 to a base
 * count without overflowing an integer. The multiply will overflow when
 * multiplying 255 by more than MAXINT/255. The sum will overflow earlier
 * depending on the base count. Since the base count is taken from a u8
 * and a few bits, it is safe to assume that it will always be lower than
 * or equal to 2*255, thus we can always prevent any overflow by accepting
 * two less 255 steps. See Documentation/lzo.txt for more information.
 */
#define MAX_255_COUNT      ((((size_t)~0) / 255) - 2)

int lzo1x_decompress_safe(const unsigned char *in, size_t in_len,
			  unsigned char *out, size_t *out_len)
{
	unsigned char *op;
	const unsigned char *ip;
	size_t t, next;
	size_t state = 0;
	const unsigned char *m_pos;
	const unsigned char * const ip_end = in + in_len;
	unsigned char * const op_end = out + *out_len;

	op = out;
	ip = in;

	if (unlikely(in_len < 3))
		goto input_overrun;
	if (*ip > 17) {
		t = *ip++ - 17;
		if (t < 4) {
			next = t;
			goto match_next;
		}
		goto copy_literal_run;
	}

	for (;;) {
		t = *ip++;
		if (t < 16) {
			if (likely(state == 0)) {
				if (unlikely(t == 0)) {
					size_t offset;
					const unsigned char *ip_last = ip;

					while (unlikely(*ip == 0)) {
						ip++;
						NEED_IP(1);
					}
					offset = ip - ip_last;
					if (unlikely(offset > MAX_255_COUNT))
						return LZO_E_ERROR;

					offset = (offset << 8) - offset;
					t += offset + 15 + *ip++;
				}
				t += 3;
copy_literal_run:
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
				if (likely(HAVE_IP(t + 15) && HAVE_OP(t + 15))) {
					const unsigned char *ie = ip + t;
					unsigned char *oe = op + t;
					do {
						COPY8(op, ip);
						op += 8;
						ip += 8;
						COPY8(op, ip);
						op += 8;
						ip += 8;
					} while (ip < ie);
					ip = ie;
					op = oe;
				} else
#endif
				{
					NEED_OP(t);
					NEED_IP(t + 3);
					do {
						*op++ = *ip++;
					} while (--t > 0);
				}
				state = 4;
				continue;
			} else if (state != 4) {
				next = t & 3;
				m_pos = op - 1;
				m_pos -= t >> 2;
				m_pos -= *ip++ << 2;
				TEST_LB(m_pos);
				NEED_OP(2);
				op[0] = m_pos[0];
				op[1] = m_pos[1];
				op += 2;
				goto match_next;
			} else {
				next = t & 3;
				m_pos = op - (1 + M2_MAX_OFFSET);
				m_pos -= t >> 2;
				m_pos -= *ip++ << 2;
				t = 3;
			}
		} else if (t >= 64) {
			next = t & 3;
			m_pos = op - 1;
			m_pos -= (t >> 2) & 7;
			m_pos -= *ip++ << 3;
			t = (t >> 5) - 1 + (3 - 1);
		} else if (t >= 32) {
			t = (t & 31) + (3 - 1);
			if (unlikely(t == 2)) {
				size_t offset;
				const unsigned char *ip_last = ip;

				while (unlikely(*ip == 0)) {
					ip++;
					NEED_IP(1);
				}
				offset = ip - ip_last;
				if (unlikely(offset > MAX_255_COUNT))
					return LZO_E_ERROR;

				offset = (offset << 8) - offset;
				t += offset + 31 + *ip++;
				NEED_IP(2);
			}
			m_pos = op - 1;
			next = get_unaligned_le16(ip);
			ip += 2;
			m_pos -= next >> 2;
			next &= 3;
		} else {
			m_pos = op;
			m_pos -= (t & 8) << 11;
			t = (t & 7) + (3 - 1);
			if (unlikely(t == 2)) {
				size_t offset;
				const unsigned char *ip_last = ip;

				while (unlikely(*ip == 0)) {
					ip++;
					NEED_IP(1);
				}
				offset = ip - ip_last;
				if (unlikely(offset > MAX_255_COUNT))
					return LZO_E_ERROR;

				offset = (offset << 8) - offset;
				t += offset + 7 + *ip++;
				NEED_IP(2);
			}
			next = get_unaligned_le16(ip);
			ip += 2;
			m_pos -= next >> 2;
			next &= 3;
			if (m_pos == op)
				goto eof_found;
			m_pos -= 0x4000;
		}
		TEST_LB(m_pos);
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
		if (op - m_pos >= 8) {
			unsigned char *oe = op + t;
			if (likely(HAVE_OP(t + 15))) {
				do {
					COPY8(op, m_pos);
					op += 8;
					m_pos += 8;
					COPY8(op, m_pos);
					op += 8;
					m_pos += 8;
				} while (op < oe);
				op = oe;
				if (HAVE_IP(6)) {
					state = next;
					COPY4(op, ip);
					op += next;
					ip += next;
					continue;
				}
			} else {
				NEED_OP(t);
				do {
					*op++ = *m_pos++;
				} while (op < oe);
			}
		} else
#endif
		{
			unsigned char *oe = op + t;
			NEED_OP(t);
			op[0] = m_pos[0];
			op[1] = m_pos[1];
			op += 2;
			m_pos += 2;
			do {
				*op++ = *m_pos++;
			} while (op < oe);
		}
match_next:
		state = next;
		t = next;
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
		if (likely(HAVE_IP(6) && HAVE_OP(4))) {
			COPY4(op, ip);
			op += t;
			ip += t;
		} else
#endif
		{
			NEED_IP(t + 3);
			NEED_OP(t);
			while (t > 0) {
				*op++ = *ip++;
				t--;
			}
		}
	}

eof_found:
	*out_len = op - out;
	return (t != 3       ? LZO_E_ERROR :
		ip == ip_end ? LZO_E_OK :
		ip <  ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN);

input_overrun:
	*out_len = op - out;
	return LZO_E_INPUT_OVERRUN;

output_overrun:
	*out_len = op - out;
	return LZO_E_OUTPUT_OVERRUN;

lookbehind_overrun:
	*out_len = op - out;
	return LZO_E_LOOKBEHIND_OVERRUN;
}
#ifndef STATIC
EXPORT_SYMBOL_GPL(lzo1x_decompress_safe);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LZO1X Decompressor");

#endif