Limit number of mines in Mines game description

Without this, it's possible to specify a description that has more
mines than there are places on the board to place them, which
eventually leads to a division by zero.  This can be demonstrated by
entering a game description of "3:r8,u," and then clicking anywhere on
the board.

1 files changed, 2 insertions, 0 deletions

diff --git a/mines.c b/mines.c
index 325c850..5674849 100644
--- a/mines.c
+++ b/mines.c
@@ -2006,6 +2006,8 @@ static const char *validate_desc(const game_params *params, const char *desc)
         desc++;
 	if (!*desc || !isdigit((unsigned char)*desc))
 	    return "No initial mine count in game description";
+	if (atoi(desc) > wh - 9)
+            return "Too many mines for grid size";
 	while (*desc && isdigit((unsigned char)*desc))
 	    desc++;		       /* skip over mine count */
 	if (*desc != ',')