File tiff-4.0.6-libtiff-tif_pixarlog.c-fix-potential-buffer-write-ov.patch of Package tiff.3178

--- tiff-4.0.6/libtiff/tif_pixarlog.c	2015-08-29 00:16:22.630733284 +0200
+++ tiff-4.0.6/libtiff/tif_pixarlog.c	2016-07-12 10:11:52.444459447 +0200
@@ -457,6 +457,7 @@
 typedef	struct {
 	TIFFPredictorState	predict;
 	z_stream		stream;
+	tmsize_t		tbuf_size; /* only set/used on reading for now */
 	uint16			*tbuf; 
 	uint16			stride;
 	int			state;
@@ -692,6 +693,7 @@
 	sp->tbuf = (uint16 *) _TIFFmalloc(tbuf_size);
 	if (sp->tbuf == NULL)
 		return (0);
+	sp->tbuf_size = tbuf_size;
 	if (sp->user_datafmt == PIXARLOGDATAFMT_UNKNOWN)
 		sp->user_datafmt = PixarLogGuessDataFmt(td);
 	if (sp->user_datafmt == PIXARLOGDATAFMT_UNKNOWN) {
@@ -781,6 +783,12 @@
 		TIFFErrorExt(tif->tif_clientdata, module, "ZLib cannot deal with buffers this size");
 		return (0);
 	}
+	/* Check that we will not fill more than what was allocated */
+	if ((tmsize_t)sp->stream.avail_out > sp->tbuf_size)
+	{
+		TIFFErrorExt(tif->tif_clientdata, module, "sp->stream.avail_out > sp->tbuf_size");
+		return (0);
+	}
 	do {
 		int state = inflate(&sp->stream, Z_PARTIAL_FLUSH);
 		if (state == Z_STREAM_END) {