Add error handling for getting config file size

1 files changed, 8 insertions, 3 deletions

diff --git a/sway/config.c b/sway/config.c
index b8c874e6..2c051146 100644
--- a/sway/config.c
+++ b/sway/config.c
@@ -561,12 +561,17 @@ static char *expand_line(const char *block, const char *line, bool add_brace) {
 bool read_config(FILE *file, struct sway_config *config) {
         bool reading_main_config = false;
         char *this_config = NULL;
-        unsigned long config_size = 0;
+        size_t config_size = 0;
         if (config->current_config == NULL) {
                 reading_main_config = true;
 
-                fseek(file, 0, SEEK_END);
-                config_size = ftell(file);
+                int ret_seek = fseek(file, 0, SEEK_END);
+                long ret_tell = ftell(file);
+                if (ret_seek == -1 || ret_tell == -1) {
+                        wlr_log(WLR_ERROR, "Unable to get size of config file");
+                        return false;
+                }
+                config_size = ret_tell;
                 rewind(file);
 
                 config->current_config = this_config = calloc(1, config_size + 1);