free_last_match() frees the memory of the match passed as argument, so accessing it is not possible after free_last_match(). Since all we need is the return code, save it locally for later usage. --- common/mlpcre/pcre-c.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/common/mlpcre/pcre-c.c b/common/mlpcre/pcre-c.c index da982025f..0762a8341 100644 --- a/common/mlpcre/pcre-c.c +++ b/common/mlpcre/pcre-c.c @@ -207,8 +207,9 @@ guestfs_int_pcre_matches (value rev, value strv) m->r = pcre_exec (re, NULL, m->subject, len, 0, 0, m->vec, veclen); if (m->r < 0 && m->r != PCRE_ERROR_NOMATCH) { + int ret = m->r; free_last_match (m); - raise_pcre_error ("pcre_exec", m->r); + raise_pcre_error ("pcre_exec", ret); } /* This error would indicate that pcre_exec ran out of space in the -- 2.14.3