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Upstream patch for CVE-2011-1167, heap-based buffer overflow in thunder
decoder (ZDI-CAN-1004).
diff -Naur tiff-3.9.4.orig/libtiff/tif_thunder.c tiff-3.9.4/libtiff/tif_thunder.c
--- tiff-3.9.4.orig/libtiff/tif_thunder.c 2010-06-08 14:50:43.000000000 -0400
+++ tiff-3.9.4/libtiff/tif_thunder.c 2011-03-18 12:17:13.635796403 -0400
@@ -55,12 +55,32 @@
static const int twobitdeltas[4] = { 0, 1, 0, -1 };
static const int threebitdeltas[8] = { 0, 1, 2, 3, 0, -3, -2, -1 };
-#define SETPIXEL(op, v) { \
- lastpixel = (v) & 0xf; \
- if (npixels++ & 1) \
- *op++ |= lastpixel; \
- else \
+#define SETPIXEL(op, v) { \
+ lastpixel = (v) & 0xf; \
+ if ( npixels < maxpixels ) \
+ { \
+ if (npixels++ & 1) \
+ *op++ |= lastpixel; \
+ else \
op[0] = (tidataval_t) (lastpixel << 4); \
+ } \
+}
+
+static int
+ThunderSetupDecode(TIFF* tif)
+{
+ static const char module[] = "ThunderSetupDecode";
+
+ if( tif->tif_dir.td_bitspersample != 4 )
+ {
+ TIFFErrorExt(tif->tif_clientdata, module,
+ "Wrong bitspersample value (%d), Thunder decoder only supports 4bits per sample.",
+ (int) tif->tif_dir.td_bitspersample );
+ return 0;
+ }
+
+
+ return (1);
}
static int
@@ -151,6 +171,7 @@
(void) scheme;
tif->tif_decoderow = ThunderDecodeRow;
tif->tif_decodestrip = ThunderDecodeRow;
+ tif->tif_setupdecode = ThunderSetupDecode;
return (1);
}
#endif /* THUNDER_SUPPORT */
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