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gzip-1.3.3-ax1.0
gzip-1.3.3-cve-2006-4337.patch
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File gzip-1.3.3-cve-2006-4337.patch of Package gzip-1.3.3-ax1.0
--- gzip-1.3.3/unlzh.c.4337 2006-09-07 13:26:24.000000000 +0200 +++ gzip-1.3.3/unlzh.c 2006-09-07 13:26:50.000000000 +0200 @@ -158,8 +158,8 @@ start[1] = 0; for (i = 1; i <= 16; i++) start[i + 1] = start[i] + (count[i] << (16 - i)); - if ((start[17] & 0xffff) != 0) - error("Bad table\n"); + if ((start[17] & 0xffff) != 0 || tablebits > 16) /* 16 for weight below */ + error("Bad table (case b)\n"); jutbits = 16 - tablebits; for (i = 1; i <= (unsigned)tablebits; i++) { @@ -173,15 +173,15 @@ i = start[tablebits + 1] >> jutbits; if (i != 0) { - k = 1 << tablebits; - while (i != k) table[i++] = 0; + k = MIN(1 << tablebits, DIST_BUFSIZE); + while (i < k) table[i++] = 0; } avail = nchar; mask = (unsigned) 1 << (15 - tablebits); for (ch = 0; ch < (unsigned)nchar; ch++) { if ((len = bitlen[ch]) == 0) continue; - nextcode = start[len] + weight[len]; + nextcode = MIN(start[len] + weight[len], DIST_BUFSIZE); if (len <= (unsigned)tablebits) { for (i = start[len]; i < nextcode; i++) table[i] = ch; } else { @@ -222,7 +222,7 @@ for (i = 0; i < 256; i++) pt_table[i] = c; } else { i = 0; - while (i < n) { + while (i < MIN(n,NPT)) { c = bitbuf >> (BITBUFSIZ - 3); if (c == 7) { mask = (unsigned) 1 << (BITBUFSIZ - 1 - 3); @@ -232,7 +232,7 @@ pt_len[i++] = c; if (i == i_special) { c = getbits(2); - while (--c >= 0) pt_len[i++] = 0; + while (--c >= 0 && i < NPT) pt_len[i++] = 0; } } while (i < nn) pt_len[i++] = 0; @@ -252,7 +252,7 @@ for (i = 0; i < 4096; i++) c_table[i] = c; } else { i = 0; - while (i < n) { + while (i < MIN(n,NC)) { c = pt_table[bitbuf >> (BITBUFSIZ - 8)]; if (c >= NT) { mask = (unsigned) 1 << (BITBUFSIZ - 1 - 8); @@ -267,7 +267,7 @@ if (c == 0) c = 1; else if (c == 1) c = getbits(4) + 3; else c = getbits(CBIT) + 20; - while (--c >= 0) c_len[i++] = 0; + while (--c >= 0 && i < NC) c_len[i++] = 0; } else c_len[i++] = c - 2; } while (i < NC) c_len[i++] = 0; @@ -360,7 +360,7 @@ while (--j >= 0) { buffer[r] = buffer[i]; i = (i + 1) & (DICSIZ - 1); - if (++r == count) return r; + if (++r >= count) return r; } for ( ; ; ) { c = decode_c(); @@ -370,14 +370,14 @@ } if (c <= UCHAR_MAX) { buffer[r] = c; - if (++r == count) return r; + if (++r >= count) return r; } else { j = c - (UCHAR_MAX + 1 - THRESHOLD); i = (r - decode_p() - 1) & (DICSIZ - 1); while (--j >= 0) { buffer[r] = buffer[i]; i = (i + 1) & (DICSIZ - 1); - if (++r == count) return r; + if (++r >= count) return r; } } } --- gzip-1.3.3/gzip.h.4337 2006-09-07 13:26:24.000000000 +0200 +++ gzip-1.3.3/gzip.h 2006-09-07 13:26:24.000000000 +0200 @@ -199,6 +199,8 @@ extern int to_stdout; /* output to stdout (-c) */ extern int save_orig_name; /* set if original name must be saved */ +#define MIN(a,b) ((a) <= (b) ? (a) : (b)) + #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(0)) #define try_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf(1)) --- gzip-1.3.3/unpack.c.4337 2006-09-07 13:26:24.000000000 +0200 +++ gzip-1.3.3/unpack.c 2006-09-07 13:26:24.000000000 +0200 @@ -13,7 +13,6 @@ #include "gzip.h" #include "crypt.h" -#define MIN(a,b) ((a) <= (b) ? (a) : (b)) /* The arguments must not have side effects. */ #define MAX_BITLEN 25
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