1 files changed, 4 insertions, 0 deletions
diff --git a/src/PJ_axisswap.c b/src/PJ_axisswap.c
index bb22f41e..0d1683b4 100644
--- a/src/PJ_axisswap.c
+++ b/src/PJ_axisswap.c
@@ -192,6 +192,10 @@ PJ *CONVERSION(axisswap,0) {
         /* read axes numbers and signs */
         for ( s = order, n = 0; *s != '\0' && n < 4; ) {
             Q->axis[n] = abs(atoi(s))-1;
+            if (Q->axis[n] <= 0 || Q->axis[n] > 3) {
+                proj_log_error(P, "axisswap: invalid axis '%d'", Q->axis[n]);
+                return pj_default_destructor(P, PJD_ERR_AXIS);
+            }
             Q->sign[n++] = sign(atoi(s));
             while ( *s != '\0' && *s != ',' )
                 s++;