1 files changed, 2 insertions, 1 deletions

diff --git a/plugins/popen.c b/plugins/popen.c
index cde3c764..d056904d 100644
--- a/plugins/popen.c
+++ b/plugins/popen.c
@@ -302,8 +302,9 @@ char *
 rtrim (char *str, const char *tok)
 {
         int i = 0;
+        int j = sizeof (str);
 
-        while (str != NULL) {
+        while (str != NULL && i < j) {
                 if (*(str + i) == *tok) {
                         sprintf (str + i, "%s", "\0");
                         return str;