[nasm:nasm-2.14.xx] labels: Make sure nil label is never passed

[nasm-bot f. C. G. <gor...@gm...>]

Commit-ID:  8e740c677345540985eba92462f44e4b272a7652
Gitweb:     http://repo.or.cz/w/nasm.git?a=commitdiff;h=8e740c677345540985eba92462f44e4b272a7652
Author:     Cyrill Gorcunov <gor...@gm...>
AuthorDate: Sat, 13 Oct 2018 17:18:05 +0300
Committer:  Cyrill Gorcunov <gor...@gm...>
CommitDate: Sat, 13 Oct 2018 17:18:05 +0300

labels: Make sure nil label is never passed

We already catched a case where we've missed
test for non nil label and in result got sigsegv,
lets rather panic next time.

Signed-off-by: Cyrill Gorcunov <gor...@gm...>


---
 asm/labels.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/asm/labels.c b/asm/labels.c
index aad473e..c00d6e5 100644
--- a/asm/labels.c
+++ b/asm/labels.c
@@ -219,6 +219,8 @@ static union label *find_label(const char *label, bool create, bool *created)
     char *label_str = NULL;
     struct hash_insert ip;
 
+    nasm_assert(label != NULL);
+
     if (islocal(label))
         label = label_str = nasm_strcat(prevlabel, label);