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CVE-2008-2327
===================================================================
--- libtiff/tif_lzw.c.orig 2008-08-17 13:03:49.090994393 -0400
+++ libtiff/tif_lzw.c 2008-08-17 13:03:52.354994400 -0400
@@ -237,6 +237,13 @@
sp->dec_codetab[code].length = 1;
sp->dec_codetab[code].next = NULL;
} while (code--);
+ /*
+ * Zero-out the unused entries
+ */
+ _TIFFmemset(&sp->dec_codetab[CODE_CLEAR], 0,
+ (CODE_FIRST-CODE_CLEAR)*sizeof (code_t));
+
+
}
return (1);
}
@@ -408,12 +415,20 @@
break;
if (code == CODE_CLEAR) {
free_entp = sp->dec_codetab + CODE_FIRST;
+ _TIFFmemset(free_entp, 0, (CSIZE-CODE_FIRST)*sizeof (code_t));
nbits = BITS_MIN;
nbitsmask = MAXCODE(BITS_MIN);
maxcodep = sp->dec_codetab + nbitsmask-1;
NextCode(tif, sp, bp, code, GetNextCode);
if (code == CODE_EOI)
break;
+ if (code == CODE_CLEAR) {
+ TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+ "LZWDecode: Corrupted LZW table at scanline %d",
+ tif->tif_row);
+ return (0);
+ }
+
*op++ = (char)code, occ--;
oldcodep = sp->dec_codetab + code;
continue;
@@ -604,12 +619,20 @@
break;
if (code == CODE_CLEAR) {
free_entp = sp->dec_codetab + CODE_FIRST;
+ _TIFFmemset(free_entp, 0, (CSIZE-CODE_FIRST)*sizeof (code_t));
nbits = BITS_MIN;
nbitsmask = MAXCODE(BITS_MIN);
maxcodep = sp->dec_codetab + nbitsmask;
NextCode(tif, sp, bp, code, GetNextCodeCompat);
if (code == CODE_EOI)
break;
+ if (code == CODE_CLEAR) {
+ TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+ "LZWDecode: Corrupted LZW table at scanline %d",
+ tif->tif_row);
+ return (0);
+ }
+
*op++ = code, occ--;
oldcodep = sp->dec_codetab + code;
continue;
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