Handle allocation failure in commands

sway/commands.c

@@ -386,7 +386,11 @@ struct cmd_results *handle_command(char *_exec, enum command_context context) {
 			if (!results) {
 				int len = strlen(criteria) + strlen(head) + 4;
 				char *tmp = malloc(len);
-				snprintf(tmp, len, "[%s] %s", criteria, head);
+				if (tmp) {
+					snprintf(tmp, len, "[%s] %s", criteria, head);
+				} else {
+					sway_log(L_DEBUG, "Unable to allocate criteria string for cmd result");
+				}
 				results = cmd_results_new(CMD_INVALID, tmp,
 					"Can't handle criteria string: Refusing to execute command");
 				free(tmp);
@@ -584,6 +588,10 @@ cleanup:
 
 struct cmd_results *cmd_results_new(enum cmd_status status, const char* input, const char *format, ...) {
 	struct cmd_results *results = malloc(sizeof(struct cmd_results));
+	if (!results) {
+		sway_log(L_ERROR, "Unable to allocate command results");
+		return NULL;
+	}
 	results->status = status;
 	if (input) {
 		results->input = strdup(input); // input is the command name
@@ -594,7 +602,9 @@ struct cmd_results *cmd_results_new(enum cmd_status status, const char* input, c
 		char *error = malloc(256);
 		va_list args;
 		va_start(args, format);
-		vsnprintf(error, 256, format, args);
+		if (error) {
+			vsnprintf(error, 256, format, args);
+		}
 		va_end(args);
 		results->error = error;
 	} else {

sway/commands/assign.c

@@ -27,6 +27,9 @@ struct cmd_results *cmd_assign(int argc, char **argv) {
 	snprintf(cmdlist, arglen, "%s%s", movecmd, *argv);
 
 	struct criteria *crit = malloc(sizeof(struct criteria));
+	if (!crit) {
+		return cmd_results_new(CMD_FAILURE, "assign", "Unable to allocate criteria");
+	}
 	crit->crit_raw = strdup(criteria);
 	crit->cmdlist = cmdlist;
 	crit->tokens = create_list();

sway/commands/bar.c

@@ -32,6 +32,9 @@ struct cmd_results *cmd_bar(int argc, char **argv) {
 
 	// Create new bar with default values
 	struct bar_config *bar = default_bar_config();
+	if (!bar) {
+		return cmd_results_new(CMD_FAILURE, "bar", "Unable to allocate bar state");
+	}
 
 	// set bar id
 	int i;
@@ -39,7 +42,11 @@ struct cmd_results *cmd_bar(int argc, char **argv) {
 		if (bar == config->bars->items[i]) {
 			const int len = 5 + numlen(i); // "bar-" + i + \0
 			bar->id = malloc(len * sizeof(char));
-			snprintf(bar->id, len, "bar-%d", i);
+			if (bar->id) {
+				snprintf(bar->id, len, "bar-%d", i);
+			} else {
+				return cmd_results_new(CMD_FAILURE, "bar", "Unable to allocate bar ID");
+			}
 			break;
 		}
 	}

sway/commands/bar/bindsym.c

@@ -26,6 +26,9 @@ struct cmd_results *bar_cmd_bindsym(int argc, char **argv) {
 		return cmd_results_new(CMD_INVALID, "bindsym", "Invalid mouse binding %s", argv[1]);
 	}
 	struct sway_mouse_binding *binding = malloc(sizeof(struct sway_mouse_binding));
+	if (!binding) {
+		return cmd_results_new(CMD_FAILURE, "bindsym", "Unable to allocate binding");
+	}
 	binding->button = numbutton;
 	binding->command = join_args(argv + 1, argc - 1);
 

sway/commands/bar/colors.c

@@ -9,6 +9,9 @@ static struct cmd_results *parse_single_color(char **color, const char *cmd_name
 
 	if (!*color) {
 		*color = malloc(10);
+		if (!*color) {
+			return cmd_results_new(CMD_FAILURE, cmd_name, "Unable to allocate color");
+		}
 	}
 
 	error = add_color(cmd_name, *color, argv[0]);
@@ -29,6 +32,9 @@ static struct cmd_results *parse_three_colors(char ***colors, const char *cmd_na
 	for (i = 0; i < 3; i++) {
 		if (!*colors[i]) {
 			*(colors[i]) = malloc(10);
+		if (!*(colors[i])) {
+			return cmd_results_new(CMD_FAILURE, cmd_name, "Unable to allocate color");
+		}
 		}
 		error = add_color(cmd_name, *(colors[i]), argv[i]);
 		if (error) {

sway/commands/bind.c

@@ -16,6 +16,10 @@ struct cmd_results *cmd_bindsym(int argc, char **argv) {
 	}
 
 	struct sway_binding *binding = malloc(sizeof(struct sway_binding));
+	if (!binding) {
+		return cmd_results_new(CMD_FAILURE, "bindsym",
+				"Unable to allocate binding");
+	}
 	binding->keys = create_list();
 	binding->modifiers = 0;
 	binding->release = false;
@@ -46,14 +50,21 @@ struct cmd_results *cmd_bindsym(int argc, char **argv) {
 			continue;
 		}
 		// Check for xkb key
-		xkb_keysym_t sym = xkb_keysym_from_name(split->items[i], XKB_KEYSYM_CASE_INSENSITIVE);
+		xkb_keysym_t sym = xkb_keysym_from_name(split->items[i],
+				XKB_KEYSYM_CASE_INSENSITIVE);
 		if (!sym) {
-			error = cmd_results_new(CMD_INVALID, "bindsym", "Unknown key '%s'", (char *)split->items[i]);
 			free_sway_binding(binding);
-			list_free(split);
-			return error;
+			free_flat_list(split);
+			return cmd_results_new(CMD_INVALID, "bindsym", "Unknown key '%s'",
+					(char *)split->items[i]);
 		}
 		xkb_keysym_t *key = malloc(sizeof(xkb_keysym_t));
+		if (!key) {
+			free_sway_binding(binding);
+			free_flat_list(split);
+			return cmd_results_new(CMD_FAILURE, "bindsym",
+					"Unable to allocate binding");
+		}
 		*key = sym;
 		list_add(binding->keys, key);
 	}
@@ -82,6 +93,10 @@ struct cmd_results *cmd_bindcode(int argc, char **argv) {
 	}
 
 	struct sway_binding *binding = malloc(sizeof(struct sway_binding));
+	if (!binding) {
+		return cmd_results_new(CMD_FAILURE, "bindsym",
+				"Unable to allocate binding");
+	}
 	binding->keys = create_list();
 	binding->modifiers = 0;
 	binding->release = false;

sway/commands/exec_always.c

@@ -39,6 +39,9 @@ struct cmd_results *cmd_exec_always(int argc, char **argv) {
 
 	pid_t pid;
 	pid_t *child = malloc(sizeof(pid_t)); // malloc'd so that Linux can avoid copying the process space
+	if (!child) {
+		return cmd_results_new(CMD_FAILURE, "exec_always", "Unable to allocate child pid");
+	}
 	// Fork process
 	if ((pid = fork()) == 0) {
 		// Fork child process again
@@ -56,7 +59,7 @@ struct cmd_results *cmd_exec_always(int argc, char **argv) {
 		_exit(0); // Close child process
 	} else if (pid < 0) {
 		free(child);
-		return cmd_results_new(CMD_FAILURE, "exec_always", "Command failed (sway could not fork).");
+		return cmd_results_new(CMD_FAILURE, "exec_always", "fork() failed");
 	}
 	close(fd[1]); // close write
 	ssize_t s = 0;
@@ -73,8 +76,6 @@ struct cmd_results *cmd_exec_always(int argc, char **argv) {
 		pw->pid = child;
 		pw->workspace = strdup(ws->name);
 		pid_workspace_add(pw);
-		// TODO: keep track of this pid and open the corresponding view on the current workspace
-		// blocked pending feature in wlc
 	} else {
 		free(child);
 	}

sway/commands/for_window.c

@@ -14,6 +14,9 @@ struct cmd_results *cmd_for_window(int argc, char **argv) {
 	char *criteria = argv[0], *cmdlist = join_args(argv + 1, argc - 1);
 
 	struct criteria *crit = malloc(sizeof(struct criteria));
+	if (!crit) {
+		return cmd_results_new(CMD_FAILURE, "for_window", "Unable to allocate criteria");
+	}
 	crit->crit_raw = strdup(criteria);
 	crit->cmdlist = cmdlist;
 	crit->tokens = create_list();

sway/commands/mode.c

@@ -30,7 +30,10 @@ struct cmd_results *cmd_mode(int argc, char **argv) {
 	}
 	// Create mode if it doesn't exist
 	if (!mode && mode_make) {
-		mode = malloc(sizeof*mode);
+		mode = malloc(sizeof(struct sway_mode));
+		if (!mode) {
+			return cmd_results_new(CMD_FAILURE, "mode", "Unable to allocate mode");
+		}
 		mode->name = strdup(mode_name);
 		mode->bindings = create_list();
 		list_add(config->modes, mode);

sway/commands/output.c

@@ -113,12 +113,20 @@ struct cmd_results *cmd_output(int argc, char **argv) {
 				src = p.we_wordv[0];
 				if (config->reading && *src != '/') {
 					char *conf = strdup(config->current_config);
-					char *conf_path = dirname(conf);
-					src = malloc(strlen(conf_path) + strlen(src) + 2);
-					sprintf(src, "%s/%s", conf_path, p.we_wordv[0]);
-					free(conf);
+					if (conf) {
+						char *conf_path = dirname(conf);
+						src = malloc(strlen(conf_path) + strlen(src) + 2);
+						if (src) {
+							sprintf(src, "%s/%s", conf_path, p.we_wordv[0]);
+						} else {
+							sway_log(L_ERROR, "Unable to allocate background source");
+						}
+						free(conf);
+					} else {
+						sway_log(L_ERROR, "Unable to allocate background source");
+					}
 				}
-				if (access(src, F_OK) == -1) {
+				if (!src || access(src, F_OK) == -1) {
 					return cmd_results_new(CMD_INVALID, "output", "Background file unreadable (%s)", src);
 				}
 				for (char *m = mode; *m; ++m) *m = tolower(*m);

sway/commands/set.c

@@ -47,6 +47,9 @@ struct cmd_results *cmd_set(int argc, char **argv) {
 		free(var->value);
 	} else {
 		var = malloc(sizeof(struct sway_variable));
+		if (!var) {
+			return cmd_results_new(CMD_FAILURE, "set", "Unable to allocate variable");
+		}
 		var->name = strdup(argv[0]);
 		list_add(config->symbols, var);
 		list_qsort(config->symbols, compare_set_qsort);