Subject: Better error handling, found by coverity
Origin: FILE5_34-16-g2f866ff0 <https://github.com/file/file/commit/FILE5_34-16-g2f866ff0>
Upstream-Author: Christos Zoulas <christos@zoulas.com>
Date: Wed Aug 1 10:02:20 2018 +0000

--- a/src/readelf.c
+++ b/src/readelf.c
@@ -891,7 +891,8 @@
 
 	offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num,
 	    fsize, virtaddr);
-	if ((buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
+	if (offset < 0 ||
+	    (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) {
 		file_badread(ms);
 		return 0;
 	}