[nasm:nasm-2.13.xx] preproc: Fix sigsegv in find_cc

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

Commit-ID:  7524cfd91492e6e3719b959498be584a9ced13af
Gitweb:     http://repo.or.cz/w/nasm.git?a=commitdiff;h=7524cfd91492e6e3719b959498be584a9ced13af
Author:     Cyrill Gorcunov <gor...@gm...>
AuthorDate: Sun, 22 Oct 2017 19:01:16 +0300
Committer:  Cyrill Gorcunov <gor...@gm...>
CommitDate: Sun, 22 Oct 2017 19:01:16 +0300

preproc: Fix sigsegv in find_cc

For specially formed code we can have skip_white_
to end up with nil pointer which should be taken
into account.

https://bugzilla.nasm.us/show_bug.cgi?id=3392435

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


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

diff --git a/asm/preproc.c b/asm/preproc.c
index cd4a949..43b62aa 100644
--- a/asm/preproc.c
+++ b/asm/preproc.c
@@ -3714,6 +3714,8 @@ static int find_cc(Token * t)
         return -1;              /* Probably a %+ without a space */
 
     skip_white_(t);
+    if (!t)
+        return -1;
     if (t->type != TOK_ID)
         return -1;
     tt = t->next;