ui-log: Prevent crash when given empty range search

Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/ui-log.c b/ui-log.c
index bc0c02c..b9771fa 100644
--- a/ui-log.c
+++ b/ui-log.c
@@ -141,49 +141,49 @@ static const char *disambiguate_ref(const char *ref)
 	unsigned char sha1[20];
 	const char *longref;
 
 	longref = fmt("refs/heads/%s", ref);
 	if (get_sha1(longref, sha1) == 0)
 		return longref;
 
 	return ref;
 }
 
 void cgit_print_log(const char *tip, int ofs, int cnt, char *grep, char *pattern,
 		    char *path, int pager)
 {
 	struct rev_info rev;
 	struct commit *commit;
 	const char *argv[] = {NULL, NULL, NULL, NULL, NULL};
 	int argc = 2;
 	int i, columns = 3;
 
 	if (!tip)
 		tip = ctx.qry.head;
 
 	argv[1] = disambiguate_ref(tip);
 
-	if (grep && pattern) {
+	if (grep && pattern && *pattern) {
 		if (!strcmp(grep, "grep") || !strcmp(grep, "author") ||
 		    !strcmp(grep, "committer"))
 			argv[argc++] = fmt("--%s=%s", grep, pattern);
 		if (!strcmp(grep, "range"))
 			argv[1] = pattern;
 	}
 
 	if (path) {
 		argv[argc++] = "--";
 		argv[argc++] = path;
 	}
 	init_revisions(&rev, NULL);
 	rev.abbrev = DEFAULT_ABBREV;
 	rev.commit_format = CMIT_FMT_DEFAULT;
 	rev.verbose_header = 1;
 	rev.show_root_diff = 0;
 	setup_revisions(argc, argv, &rev, NULL);
 	load_ref_decorations(DECORATE_FULL_REFS);
 	rev.show_decorations = 1;
 	rev.grep_filter.regflags |= REG_ICASE;
 	compile_grep_patterns(&rev.grep_filter);
 	prepare_revision_walk(&rev);
 
 	if (pager)