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-rw-r--r--strbuf.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/strbuf.c b/strbuf.c
index bc3a0802ea..65b4cf4343 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -399,6 +399,8 @@ int strbuf_branchname(struct strbuf *sb, const char *name)
int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
{
strbuf_branchname(sb, name);
+ if (name[0] == '-')
+ return CHECK_REF_FORMAT_ERROR;
strbuf_splice(sb, 0, 0, "refs/heads/", 11);
return check_ref_format(sb->buf);
}