1 files changed, 5 insertions, 2 deletions

diff --git a/monitor_wrap.c b/monitor_wrap.c
index 8cfc8cc08..332652895 100644
--- a/monitor_wrap.c
+++ b/monitor_wrap.c
@@ -776,8 +776,11 @@ mm_sshpam_query(void *ctx, char **name, char **info,
         *name = buffer_get_string(&m, NULL);
         *info = buffer_get_string(&m, NULL);
         *num = buffer_get_int(&m);
-        *prompts = xmalloc((*num + 1) * sizeof(char *));
-        *echo_on = xmalloc((*num + 1) * sizeof(u_int));
+        if (*num > PAM_MAX_NUM_MSG)
+                fatal("%s: recieved %u PAM messages, expected <= %u",
+                    __func__, *num, PAM_MAX_NUM_MSG);
+        *prompts = xcalloc((*num + 1), sizeof(char *));
+        *echo_on = xcalloc((*num + 1), sizeof(u_int));
         for (i = 0; i < *num; ++i) {
                 (*prompts)[i] = buffer_get_string(&m, NULL);
                 (*echo_on)[i] = buffer_get_int(&m);