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cleanup output-background subcommand handling

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- fixes a double-free error when access() failed.

- refactor code to make memory managment (alloc/free) more straightforward
   - do not bring the temporary wordexp_t struct around
   - do not postpone errors handling
This commit is contained in:
ael-code 2018-06-26 12:57:22 +02:00
parent 4550cb2b3e
commit a4578815f1
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GPG Key ID: 3390538CF7E96023
1 changed files with 29 additions and 22 deletions
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51
sway/commands/output/background.c
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@ -69,42 +69,49 @@ struct cmd_results *output_cmd_background(int argc, char **argv) {
return cmd_res; return cmd_res;
} }
free(src); free(src);
src = p.we_wordv[0]; src = strdup(p.we_wordv[0]);
wordfree(&p);
if (!src) {
wlr_log(L_ERROR, "Failed to duplicate string");
return cmd_results_new(CMD_FAILURE, "output",
"Unable to allocate resource");
}
if (config->reading && *src != '/') { if (config->reading && *src != '/') {
// src file is inside configuration dir
char *conf = strdup(config->current_config); char *conf = strdup(config->current_config);
if (conf) { if(!conf) {
char *conf_path = dirname(conf); wlr_log(L_ERROR, "Failed to duplicate string");
src = malloc(strlen(conf_path) + strlen(src) + 2); return cmd_results_new(CMD_FAILURE, "output",
if (!src) {
free(conf);
wordfree(&p);
wlr_log(L_ERROR,
"Unable to allocate resource: Not enough memory");
return cmd_results_new(CMD_FAILURE, "output",
"Unable to allocate resources"); "Unable to allocate resources");
}
sprintf(src, "%s/%s", conf_path, p.we_wordv[0]);
free(conf);
} else {
wlr_log(L_ERROR, "Unable to allocate background source");
} }
char *conf_path = dirname(conf);
char *rel_path = src;
src = malloc(strlen(conf_path) + strlen(src) + 2);
if (!src) {
free(rel_path);
free(conf);
wlr_log(L_ERROR, "Unable to allocate memory");
return cmd_results_new(CMD_FAILURE, "output",
"Unable to allocate resources");
}
sprintf(src, "%s/%s", conf_path, rel_path);
free(rel_path);
free(conf);
} }
if (access(src, F_OK) == -1) { if (access(src, F_OK) == -1) {
struct cmd_results *cmd_res = cmd_results_new(CMD_FAILURE, "output", struct cmd_results *cmd_res = cmd_results_new(CMD_FAILURE, "output",
"Unable to access background file '%s': %s", src, strerror(errno)); "Unable to access background file '%s': %s", src, strerror(errno));
free(src); free(src);
wordfree(&p);
return cmd_res; return cmd_res;
} }
output->background = strdup(src); output->background = src;
output->background_option = strdup(mode); output->background_option = strdup(mode);
if (src != p.we_wordv[0]) {
free(src);
}
wordfree(&p);
argc -= j + 1; argv += j + 1; argc -= j + 1; argv += j + 1;
} }