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SubjectRe: [PATCH 6/9] perf record: Support synthesizing cgroup events
On Tue, Jan 07, 2020 at 10:34:58PM +0900, Namhyung Kim wrote:

SNIP

> + if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
> + pr_debug("process synth event failed\n");
> + return -1;
> + }
> +
> + return 0;
> +}
> +
> +static int perf_event__walk_cgroup_tree(struct perf_tool *tool,
> + union perf_event *event,
> + char *path, size_t mount_len,
> + perf_event__handler_t process,
> + struct machine *machine)
> +{
> + size_t pos = strlen(path);
> + DIR *d;
> + struct dirent *dent;
> + int ret = 0;
> +
> + if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
> + process, machine) < 0)
> + return -1;
> +
> + d = opendir(path);
> + if (d == NULL) {
> + pr_debug("failed to open directory: %s\n", path);
> + return -1;
> + }
> +
> + while ((dent = readdir(d)) != NULL) {
> + if (dent->d_type != DT_DIR)
> + continue;
> + if (!strcmp(dent->d_name, ".") ||
> + !strcmp(dent->d_name, ".."))
> + continue;
> +
> + if (path[pos - 1] != '/')
> + strcat(path, "/");
> + strcat(path, dent->d_name);

shouldn't you also check for the max size of path in here?

jirka

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