3.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: "Markus F.X.J. Oberhumer" <mar...@oberhumer.com> commit b6bec26cea948148a9420e7a0ac337f925de49e7 upstream. Rename the source file to match the function name and thereby also make room for a possible future even slightly faster "non-safe" decompressor version. Signed-off-by: Markus F.X.J. Oberhumer <mar...@oberhumer.com> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- lib/decompress_unlzo.c | 2 lib/lzo/Makefile | 2 lib/lzo/lzo1x_decompress.c | 255 ---------------------------------------- lib/lzo/lzo1x_decompress_safe.c | 255 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 257 insertions(+), 257 deletions(-) --- a/lib/decompress_unlzo.c +++ b/lib/decompress_unlzo.c @@ -31,7 +31,7 @@ */ #ifdef STATIC -#include "lzo/lzo1x_decompress.c" +#include "lzo/lzo1x_decompress_safe.c" #else #include <linux/decompress/unlzo.h> #endif --- a/lib/lzo/Makefile +++ b/lib/lzo/Makefile @@ -1,5 +1,5 @@ lzo_compress-objs := lzo1x_compress.o -lzo_decompress-objs := lzo1x_decompress.o +lzo_decompress-objs := lzo1x_decompress_safe.o obj-$(CONFIG_LZO_COMPRESS) += lzo_compress.o obj-$(CONFIG_LZO_DECOMPRESS) += lzo_decompress.o --- a/lib/lzo/lzo1x_decompress.c +++ /dev/null @@ -1,255 +0,0 @@ -/* - * LZO1X Decompressor from MiniLZO - * - * Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <mar...@oberhumer.com> - * - * The full LZO package can be found at: - * http://www.oberhumer.com/opensource/lzo/ - * - * Changed for kernel use by: - * Nitin Gupta <nitingupta...@gmail.com> - * Richard Purdie <rpur...@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, ip_end, ip) ((size_t)(ip_end - ip) < (x)) -#define HAVE_OP(x, op_end, op) ((size_t)(op_end - op) < (x)) -#define HAVE_LB(m_pos, out, op) (m_pos < out || m_pos >= op) - -#define COPY4(dst, src) \ - put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst)) - -int lzo1x_decompress_safe(const unsigned char *in, size_t in_len, - unsigned char *out, size_t *out_len) -{ - const unsigned char * const ip_end = in + in_len; - unsigned char * const op_end = out + *out_len; - const unsigned char *ip = in, *m_pos; - unsigned char *op = out; - size_t t; - - *out_len = 0; - - if (*ip > 17) { - t = *ip++ - 17; - if (t < 4) - goto match_next; - if (HAVE_OP(t, op_end, op)) - goto output_overrun; - if (HAVE_IP(t + 1, ip_end, ip)) - goto input_overrun; - do { - *op++ = *ip++; - } while (--t > 0); - goto first_literal_run; - } - - while ((ip < ip_end)) { - t = *ip++; - if (t >= 16) - goto match; - if (t == 0) { - if (HAVE_IP(1, ip_end, ip)) - goto input_overrun; - while (*ip == 0) { - t += 255; - ip++; - if (HAVE_IP(1, ip_end, ip)) - goto input_overrun; - } - t += 15 + *ip++; - } - if (HAVE_OP(t + 3, op_end, op)) - goto output_overrun; - if (HAVE_IP(t + 4, ip_end, ip)) - goto input_overrun; - - COPY4(op, ip); - op += 4; - ip += 4; - if (--t > 0) { - if (t >= 4) { - do { - COPY4(op, ip); - op += 4; - ip += 4; - t -= 4; - } while (t >= 4); - if (t > 0) { - do { - *op++ = *ip++; - } while (--t > 0); - } - } else { - do { - *op++ = *ip++; - } while (--t > 0); - } - } - -first_literal_run: - t = *ip++; - if (t >= 16) - goto match; - m_pos = op - (1 + M2_MAX_OFFSET); - m_pos -= t >> 2; - m_pos -= *ip++ << 2; - - if (HAVE_LB(m_pos, out, op)) - goto lookbehind_overrun; - - if (HAVE_OP(3, op_end, op)) - goto output_overrun; - *op++ = *m_pos++; - *op++ = *m_pos++; - *op++ = *m_pos; - - goto match_done; - - do { -match: - if (t >= 64) { - m_pos = op - 1; - m_pos -= (t >> 2) & 7; - m_pos -= *ip++ << 3; - t = (t >> 5) - 1; - if (HAVE_LB(m_pos, out, op)) - goto lookbehind_overrun; - if (HAVE_OP(t + 3 - 1, op_end, op)) - goto output_overrun; - goto copy_match; - } else if (t >= 32) { - t &= 31; - if (t == 0) { - if (HAVE_IP(1, ip_end, ip)) - goto input_overrun; - while (*ip == 0) { - t += 255; - ip++; - if (HAVE_IP(1, ip_end, ip)) - goto input_overrun; - } - t += 31 + *ip++; - } - m_pos = op - 1; - m_pos -= get_unaligned_le16(ip) >> 2; - ip += 2; - } else if (t >= 16) { - m_pos = op; - m_pos -= (t & 8) << 11; - - t &= 7; - if (t == 0) { - if (HAVE_IP(1, ip_end, ip)) - goto input_overrun; - while (*ip == 0) { - t += 255; - ip++; - if (HAVE_IP(1, ip_end, ip)) - goto input_overrun; - } - t += 7 + *ip++; - } - m_pos -= get_unaligned_le16(ip) >> 2; - ip += 2; - if (m_pos == op) - goto eof_found; - m_pos -= 0x4000; - } else { - m_pos = op - 1; - m_pos -= t >> 2; - m_pos -= *ip++ << 2; - - if (HAVE_LB(m_pos, out, op)) - goto lookbehind_overrun; - if (HAVE_OP(2, op_end, op)) - goto output_overrun; - - *op++ = *m_pos++; - *op++ = *m_pos; - goto match_done; - } - - if (HAVE_LB(m_pos, out, op)) - goto lookbehind_overrun; - if (HAVE_OP(t + 3 - 1, op_end, op)) - goto output_overrun; - - if (t >= 2 * 4 - (3 - 1) && (op - m_pos) >= 4) { - COPY4(op, m_pos); - op += 4; - m_pos += 4; - t -= 4 - (3 - 1); - do { - COPY4(op, m_pos); - op += 4; - m_pos += 4; - t -= 4; - } while (t >= 4); - if (t > 0) - do { - *op++ = *m_pos++; - } while (--t > 0); - } else { -copy_match: - *op++ = *m_pos++; - *op++ = *m_pos++; - do { - *op++ = *m_pos++; - } while (--t > 0); - } -match_done: - t = ip[-2] & 3; - if (t == 0) - break; -match_next: - if (HAVE_OP(t, op_end, op)) - goto output_overrun; - if (HAVE_IP(t + 1, ip_end, ip)) - goto input_overrun; - - *op++ = *ip++; - if (t > 1) { - *op++ = *ip++; - if (t > 2) - *op++ = *ip++; - } - - t = *ip++; - } while (ip < ip_end); - } - - *out_len = op - out; - return LZO_E_EOF_NOT_FOUND; - -eof_found: - *out_len = op - out; - return (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 --- /dev/null +++ b/lib/lzo/lzo1x_decompress_safe.c @@ -0,0 +1,255 @@ +/* + * LZO1X Decompressor from MiniLZO + * + * Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <mar...@oberhumer.com> + * + * The full LZO package can be found at: + * http://www.oberhumer.com/opensource/lzo/ + * + * Changed for kernel use by: + * Nitin Gupta <nitingupta...@gmail.com> + * Richard Purdie <rpur...@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, ip_end, ip) ((size_t)(ip_end - ip) < (x)) +#define HAVE_OP(x, op_end, op) ((size_t)(op_end - op) < (x)) +#define HAVE_LB(m_pos, out, op) (m_pos < out || m_pos >= op) + +#define COPY4(dst, src) \ + put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst)) + +int lzo1x_decompress_safe(const unsigned char *in, size_t in_len, + unsigned char *out, size_t *out_len) +{ + const unsigned char * const ip_end = in + in_len; + unsigned char * const op_end = out + *out_len; + const unsigned char *ip = in, *m_pos; + unsigned char *op = out; + size_t t; + + *out_len = 0; + + if (*ip > 17) { + t = *ip++ - 17; + if (t < 4) + goto match_next; + if (HAVE_OP(t, op_end, op)) + goto output_overrun; + if (HAVE_IP(t + 1, ip_end, ip)) + goto input_overrun; + do { + *op++ = *ip++; + } while (--t > 0); + goto first_literal_run; + } + + while ((ip < ip_end)) { + t = *ip++; + if (t >= 16) + goto match; + if (t == 0) { + if (HAVE_IP(1, ip_end, ip)) + goto input_overrun; + while (*ip == 0) { + t += 255; + ip++; + if (HAVE_IP(1, ip_end, ip)) + goto input_overrun; + } + t += 15 + *ip++; + } + if (HAVE_OP(t + 3, op_end, op)) + goto output_overrun; + if (HAVE_IP(t + 4, ip_end, ip)) + goto input_overrun; + + COPY4(op, ip); + op += 4; + ip += 4; + if (--t > 0) { + if (t >= 4) { + do { + COPY4(op, ip); + op += 4; + ip += 4; + t -= 4; + } while (t >= 4); + if (t > 0) { + do { + *op++ = *ip++; + } while (--t > 0); + } + } else { + do { + *op++ = *ip++; + } while (--t > 0); + } + } + +first_literal_run: + t = *ip++; + if (t >= 16) + goto match; + m_pos = op - (1 + M2_MAX_OFFSET); + m_pos -= t >> 2; + m_pos -= *ip++ << 2; + + if (HAVE_LB(m_pos, out, op)) + goto lookbehind_overrun; + + if (HAVE_OP(3, op_end, op)) + goto output_overrun; + *op++ = *m_pos++; + *op++ = *m_pos++; + *op++ = *m_pos; + + goto match_done; + + do { +match: + if (t >= 64) { + m_pos = op - 1; + m_pos -= (t >> 2) & 7; + m_pos -= *ip++ << 3; + t = (t >> 5) - 1; + if (HAVE_LB(m_pos, out, op)) + goto lookbehind_overrun; + if (HAVE_OP(t + 3 - 1, op_end, op)) + goto output_overrun; + goto copy_match; + } else if (t >= 32) { + t &= 31; + if (t == 0) { + if (HAVE_IP(1, ip_end, ip)) + goto input_overrun; + while (*ip == 0) { + t += 255; + ip++; + if (HAVE_IP(1, ip_end, ip)) + goto input_overrun; + } + t += 31 + *ip++; + } + m_pos = op - 1; + m_pos -= get_unaligned_le16(ip) >> 2; + ip += 2; + } else if (t >= 16) { + m_pos = op; + m_pos -= (t & 8) << 11; + + t &= 7; + if (t == 0) { + if (HAVE_IP(1, ip_end, ip)) + goto input_overrun; + while (*ip == 0) { + t += 255; + ip++; + if (HAVE_IP(1, ip_end, ip)) + goto input_overrun; + } + t += 7 + *ip++; + } + m_pos -= get_unaligned_le16(ip) >> 2; + ip += 2; + if (m_pos == op) + goto eof_found; + m_pos -= 0x4000; + } else { + m_pos = op - 1; + m_pos -= t >> 2; + m_pos -= *ip++ << 2; + + if (HAVE_LB(m_pos, out, op)) + goto lookbehind_overrun; + if (HAVE_OP(2, op_end, op)) + goto output_overrun; + + *op++ = *m_pos++; + *op++ = *m_pos; + goto match_done; + } + + if (HAVE_LB(m_pos, out, op)) + goto lookbehind_overrun; + if (HAVE_OP(t + 3 - 1, op_end, op)) + goto output_overrun; + + if (t >= 2 * 4 - (3 - 1) && (op - m_pos) >= 4) { + COPY4(op, m_pos); + op += 4; + m_pos += 4; + t -= 4 - (3 - 1); + do { + COPY4(op, m_pos); + op += 4; + m_pos += 4; + t -= 4; + } while (t >= 4); + if (t > 0) + do { + *op++ = *m_pos++; + } while (--t > 0); + } else { +copy_match: + *op++ = *m_pos++; + *op++ = *m_pos++; + do { + *op++ = *m_pos++; + } while (--t > 0); + } +match_done: + t = ip[-2] & 3; + if (t == 0) + break; +match_next: + if (HAVE_OP(t, op_end, op)) + goto output_overrun; + if (HAVE_IP(t + 1, ip_end, ip)) + goto input_overrun; + + *op++ = *ip++; + if (t > 1) { + *op++ = *ip++; + if (t > 2) + *op++ = *ip++; + } + + t = *ip++; + } while (ip < ip_end); + } + + *out_len = op - out; + return LZO_E_EOF_NOT_FOUND; + +eof_found: + *out_len = op - out; + return (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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
