diff options
| -rw-r--r-- | flip.c | 10 |
1 files changed, 9 insertions, 1 deletions
@@ -8,6 +8,7 @@ #include <string.h> #include <assert.h> #include <ctype.h> +#include <limits.h> #include <math.h> #include "puzzles.h" @@ -181,9 +182,16 @@ static game_params *custom_params(const config_item *cfg) static const char *validate_params(const game_params *params, bool full) { + int wh; + if (params->w <= 0 || params->h <= 0) return "Width and height must both be greater than zero"; - return NULL; + if (params->w > (INT_MAX - 3) / params->h) + return "Width times height must not be unreasonably large"; + wh = params->w * params->h; + if (wh > (INT_MAX - 3) / wh) + return "Width times height is too large"; + return NULL; } static char *encode_bitmap(unsigned char *bmp, int len) |