diff -upk.orig tiff-3.8.2.orig/tools/tiffdump.c tiff-3.8.2/tools/tiffdump.c
--- tiff-3.8.2.orig/tools/tiffdump.c	2005-12-02 16:01:33 +0000
+++ tiff-3.8.2/tools/tiffdump.c	2007-03-30 00:03:17 +0000
@@ -187,8 +187,8 @@ dump(int fd, off_t diroff)
 {
 	unsigned i;
 
-	lseek(fd, (off_t) 0, 0);
-	if (read(fd, (char*) &hdr, sizeof (hdr)) != sizeof (hdr))
+	if (lseek(fd, (off_t) 0, 0) != (off_t) 0 ||
+	    read(fd, (char*) &hdr, sizeof (hdr)) != sizeof (hdr))
 		ReadError("TIFF header");
 	/*
 	 * Setup the byte order handling.
@@ -265,7 +265,7 @@ static off_t
 ReadDirectory(int fd, unsigned ix, off_t off)
 {
 	register TIFFDirEntry *dp;
-	register unsigned int n;
+	register int n;
 	TIFFDirEntry *dir = 0;
 	uint16 dircount;
 	int space;
@@ -273,7 +273,7 @@ ReadDirectory(int fd, unsigned ix, off_t
 
 	if (off == 0)			/* no more directories */
 		goto done;
-	if (lseek(fd, (off_t) off, 0) != off) {
+	if (lseek(fd, off, 0) != off) {
 		Fatal("Seek error accessing TIFF directory");
 		goto done;
 	}
@@ -289,10 +289,14 @@ ReadDirectory(int fd, unsigned ix, off_t
 		goto done;
 	}
 	n = read(fd, (char*) dir, dircount*sizeof (*dp));
+	if (n < 0) {
+		ReadError("TIFF directory");
+		goto done;
+	}
 	if (n != dircount*sizeof (*dp)) {
 		n /= sizeof (*dp);
 		Error(
-	    "Could only read %u of %u entries in directory at offset %#lx",
+	    "Could only read %d of %u entries in directory at offset %#lx",
 		    n, dircount, (unsigned long) off);
 		dircount = n;
 	}
@@ -708,8 +712,9 @@ TIFFFetchData(int fd, TIFFDirEntry* dir,
 
 	w = (dir->tdir_type < NWIDTHS ? datawidth[dir->tdir_type] : 0);
 	cc = dir->tdir_count * w;
-	if (lseek(fd, (off_t)dir->tdir_offset, 0) != (off_t)-1
-	    && read(fd, cp, cc) != -1) {
+	if (cc > 0
+	    && lseek(fd, (off_t)dir->tdir_offset, 0) != (off_t)-1
+	    && read(fd, cp, cc) == cc) {
 		if (swabflag) {
 			switch (dir->tdir_type) {
 			case TIFF_SHORT: