40c5c9724249bdff5eb8333acef141f20eaf7a1c
markd
  Tue Sep 4 16:02:12 2018 -0700
fixed segv when parsing invalid GFF3 header

diff --git src/lib/gff3.c src/lib/gff3.c
index 6250739..6b8179b 100644
--- src/lib/gff3.c
+++ src/lib/gff3.c
@@ -879,31 +879,31 @@
 /* parse one line of a gff3 file */
 {
 if (startsWith("##", line))
     parseMeta(g3f, line);
 else if (!startsWith("#", line) && (strlen(line) > 0))
     parseAnn(g3f, line);
 }
 
 static void parseHeader(struct gff3File *g3f)
 /* parse and validate a GFF3 header */
 {
 char *line;
 if (!lineFileNext(g3f->lf, &line, NULL))
     gff3FileErr(g3f, FALSE, "empty GFF file, must have header");
 char *ver = skipToSpaces(line);
-if (*ver != '\0')
+if ((ver != NULL) && (*ver != '\0'))
     {
     *ver++ = '\0';
     ver = trimSpaces(ver);
     }
 if (!(sameString(line, "##gff-version") && sameString(ver, "3")))
     gff3FileErr(g3f, TRUE, "invalid GFF3 header");
 }
 
 static void parseFile(struct gff3File *g3f)
 /* do parsing phase of reading a GFF3 file */
 {
 g3f->lf = lineFileOpen(g3f->fileName, TRUE);
 parseHeader(g3f);
 char *line;
 while (lineFileNext(g3f->lf, &line, NULL))