Subject: Prevent negative array index in getMetaRefreshParam()
From: Tatsuya Kinoshita <tats@debian.org>
Bug-Debian: https://github.com/tats/w3m/issues/63
Origin: https://anonscm.debian.org/cgit/collab-maint/w3m.git/commit/?id=6c6a2cbced21ceec2fac08fba1ad271a77f9dbc2

---
 file.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/file.c b/file.c
index e82eaf1..18b350a 100644
--- a/file.c
+++ b/file.c
@@ -4361,8 +4361,9 @@ getMetaRefreshParam(char *q, Str *refresh_uri)
 		r++;
 	    s_tmp = Strnew_charp_n(q, r - q);
 
-	    if (s_tmp->ptr[s_tmp->length - 1] == '\"'          /* " */
-	       || s_tmp->ptr[s_tmp->length - 1] == '\'') {     /* ' */
+	    if (s_tmp->length > 0 &&
+	        (s_tmp->ptr[s_tmp->length - 1] == '\"' ||	/* " */
+		 s_tmp->ptr[s_tmp->length - 1] == '\'')) {	/* ' */
 		s_tmp->length--;
 		s_tmp->ptr[s_tmp->length] = '\0';
 	    }
-- 
2.10.2