Index: head/usr.bin/gzip/gzip.c
===================================================================
--- head/usr.bin/gzip/gzip.c
+++ head/usr.bin/gzip/gzip.c
@@ -1443,7 +1443,7 @@
 	struct stat isb, osb;
 	off_t size;
 	ssize_t rbytes;
-	unsigned char header1[4];
+	unsigned char fourbytes[4];
 	enum filetype method;
 	int fd, ofd, zfd = -1;
 	int error;
@@ -1477,8 +1477,8 @@
 		goto lose;
 	}
 
-	rbytes = read(fd, header1, sizeof header1);
-	if (rbytes != sizeof header1) {
+	rbytes = read(fd, fourbytes, sizeof fourbytes);
+	if (rbytes != sizeof fourbytes) {
 		/* we don't want to fail here. */
 #ifndef SMALL
 		if (fflag)
@@ -1492,7 +1492,7 @@
 	}
 	infile_newdata(rbytes);
 
-	method = file_gettype(header1);
+	method = file_gettype(fourbytes);
 #ifndef SMALL
 	if (fflag == 0 && method == FT_UNKNOWN) {
 		maybe_warnx("%s: not in gzip format", file);
@@ -1516,7 +1516,7 @@
 		infile_newdata(rv);
 		timestamp = le32dec(&ts[0]);
 
-		if (header1[3] & ORIG_NAME) {
+		if (fourbytes[3] & ORIG_NAME) {
 			rbytes = pread(fd, name, sizeof(name) - 1, GZIP_ORIGNAME);
 			if (rbytes < 0) {
 				maybe_warn("can't read %s", file);
@@ -1818,7 +1818,7 @@
 handle_stdin(void)
 {
 	struct stat isb;
-	unsigned char header1[4];
+	unsigned char fourbytes[4];
 	size_t in_size;
 	off_t usize, gsize;
 	enum filetype method;
@@ -1849,16 +1849,16 @@
 		goto out;
 	}
 
-	bytes_read = read_retry(STDIN_FILENO, header1, sizeof header1);
+	bytes_read = read_retry(STDIN_FILENO, fourbytes, sizeof fourbytes);
 	if (bytes_read == -1) {
 		maybe_warn("can't read stdin");
 		goto out;
-	} else if (bytes_read != sizeof(header1)) {
+	} else if (bytes_read != sizeof(fourbytes)) {
 		maybe_warnx("(stdin): unexpected end of file");
 		goto out;
 	}
 
-	method = file_gettype(header1);
+	method = file_gettype(fourbytes);
 	switch (method) {
 	default:
 #ifndef SMALL
@@ -1866,17 +1866,17 @@
 			maybe_warnx("unknown compression format");
 			goto out;
 		}
-		usize = cat_fd(header1, sizeof header1, &gsize, STDIN_FILENO);
+		usize = cat_fd(fourbytes, sizeof fourbytes, &gsize, STDIN_FILENO);
 		break;
 #endif
 	case FT_GZIP:
 		usize = gz_uncompress(STDIN_FILENO, STDOUT_FILENO,
-			      (char *)header1, sizeof header1, &gsize, "(stdin)");
+			      (char *)fourbytes, sizeof fourbytes, &gsize, "(stdin)");
 		break;
 #ifndef NO_BZIP2_SUPPORT
 	case FT_BZIP2:
 		usize = unbzip2(STDIN_FILENO, STDOUT_FILENO,
-				(char *)header1, sizeof header1, &gsize);
+				(char *)fourbytes, sizeof fourbytes, &gsize);
 		break;
 #endif
 #ifndef NO_COMPRESS_SUPPORT
@@ -1886,27 +1886,27 @@
 			goto out;
 		}
 
-		usize = zuncompress(in, stdout, (char *)header1,
-		    sizeof header1, &gsize);
+		usize = zuncompress(in, stdout, (char *)fourbytes,
+		    sizeof fourbytes, &gsize);
 		fclose(in);
 		break;
 #endif
 #ifndef NO_PACK_SUPPORT
 	case FT_PACK:
 		usize = unpack(STDIN_FILENO, STDOUT_FILENO,
-			       (char *)header1, sizeof header1, &gsize);
+			       (char *)fourbytes, sizeof fourbytes, &gsize);
 		break;
 #endif
 #ifndef NO_XZ_SUPPORT
 	case FT_XZ:
 		usize = unxz(STDIN_FILENO, STDOUT_FILENO,
-			     (char *)header1, sizeof header1, &gsize);
+			     (char *)fourbytes, sizeof fourbytes, &gsize);
 		break;
 #endif
 #ifndef NO_LZ_SUPPORT
 	case FT_LZ:
 		usize = unlz(STDIN_FILENO, STDOUT_FILENO,
-			     (char *)header1, sizeof header1, &gsize);
+			     (char *)fourbytes, sizeof fourbytes, &gsize);
 		break;
 #endif
 	}
Index: head/usr.bin/gzip/unlz.c
===================================================================
--- head/usr.bin/gzip/unlz.c
+++ head/usr.bin/gzip/unlz.c
@@ -618,8 +618,6 @@
 
 	char header[HDR_SIZE];
 
-	if (prelen > sizeof(header))
-		return -1;
 	if (pre && prelen)
 		memcpy(header, pre, prelen);
 	
Index: head/usr.bin/gzip/unpack.c
===================================================================
--- head/usr.bin/gzip/unpack.c
+++ head/usr.bin/gzip/unpack.c
@@ -156,9 +156,6 @@
 	ssize_t bytesread;		/* Bytes read from the file */
 	int i, j, thisbyte;
 
-	if (prelen > sizeof hdr)
-		maybe_err("prelen too long");
-
 	/* Prepend the header buffer if we already read some data */
 	if (prelen != 0)
 		memcpy(hdr, pre, prelen);