X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/puzzles/blobdiff_plain/e1a449049f516296fe30b2286cd4a55a12cadbb2..c87c7d3b6ae05d54cc6a689b49015c25125a7838:/bridges.c

diff --git a/bridges.c b/bridges.c
index 694f011..64501ef 100644
--- a/bridges.c
+++ b/bridges.c
@@ -2244,6 +2244,8 @@ static game_state *execute_move(game_state *state, char *move)
             if (sscanf(move, "%d,%d,%d,%d,%d%n",
                        &x1, &y1, &x2, &y2, &nl, &n) != 5)
                 goto badmove;
+            if (!INGRID(ret, x1, y1) || !INGRID(ret, x2, y2))
+                goto badmove;
             is1 = INDEX(ret, gridi, x1, y1);
             is2 = INDEX(ret, gridi, x2, y2);
             if (!is1 || !is2) goto badmove;
@@ -2253,6 +2255,8 @@ static game_state *execute_move(game_state *state, char *move)
             if (sscanf(move, "%d,%d,%d,%d%n",
                        &x1, &y1, &x2, &y2, &n) != 4)
                 goto badmove;
+            if (!INGRID(ret, x1, y1) || !INGRID(ret, x2, y2))
+                goto badmove;
             is1 = INDEX(ret, gridi, x1, y1);
             is2 = INDEX(ret, gridi, x2, y2);
             if (!is1 || !is2) goto badmove;
@@ -2261,6 +2265,8 @@ static game_state *execute_move(game_state *state, char *move)
             if (sscanf(move, "%d,%d%n",
                        &x1, &y1, &n) != 2)
                 goto badmove;
+            if (!INGRID(ret, x1, y1))
+                goto badmove;
             is1 = INDEX(ret, gridi, x1, y1);
             if (!is1) goto badmove;
             island_togglemark(is1);