From f878216982d0d326ac8397a1a436b2fd60ed54e2 Mon Sep 17 00:00:00 2001 From: Norihiro Tanaka Date: Sat, 15 Nov 2014 22:21:34 -0800 Subject: [PATCH] dfa: avoid undefined behavior * src/dfa.c (dfassbuild): Don't call memcpy with a second argument of NULL, even when the size (3rd argument) is 0. --- src/dfa.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/src/dfa.c b/src/dfa.c index e0fc120..65862e8 100644 --- a/src/dfa.c +++ b/src/dfa.c @@ -3660,8 +3660,11 @@ dfassbuild (struct dfa *d) sup->musts = NULL; sup->charclasses = xnmalloc (sup->calloc, sizeof *sup->charclasses); - memcpy (sup->charclasses, d->charclasses, - d->cindex * sizeof *sup->charclasses); + if (d->cindex) + { + memcpy (sup->charclasses, d->charclasses, + d->cindex * sizeof *sup->charclasses); + } sup->tokens = xnmalloc (d->tindex, 2 * sizeof *sup->tokens); sup->talloc = d->tindex * 2; -- 2.1.2