1 files changed, 3 insertions, 1 deletions

diff --git a/ssh-add.c b/ssh-add.c
index efbf771d3..3adc2509f 100644
--- a/ssh-add.c
+++ b/ssh-add.c
@@ -117,7 +117,9 @@ ssh_askpass(char *askpass, char *msg)
                 fatal("ssh_askpass: exec(%s): %s", askpass, strerror(errno));
         }
         close(p[1]);
-        len = atomicio(read, p[0], buf, sizeof buf);
+        buf[0] = '\0';
+        atomicio(read, p[0], buf, sizeof buf);
+        len = strlen(buf);
         close(p[0]);
         while (waitpid(pid, &status, 0) < 0)
                 if (errno != EINTR)