[PATCH 01/13] perf header: Validate nr_domains when reading HEADER_CPU_DOMAIN_INFO

[Arnaldo Carvalho de Melo]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

Further validate the HEADER_CPU_DOMAIN_INFO fields, this time checking
the nr_domains field.

Assisted-by: Claude Code:claude-opus-4-6
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/header.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index c6efddb70aee2904..a2796b72adc4d908 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -3731,6 +3731,12 @@ static int process_cpu_domain_info(struct feat_fd *ff, void *data __maybe_unused
 		if (do_read_u32(ff, &nr_domains))
 			return -1;
 
+		if (nr_domains > max_sched_domains) {
+			pr_err("Invalid HEADER_CPU_DOMAIN_INFO: nr_domains %u > max_sched_domains (%u)\n",
+			       nr_domains, max_sched_domains);
+			return -1;
+		}
+
 		cd_map[cpu]->nr_domains = nr_domains;
 
 		cd_map[cpu]->domains = calloc(max_sched_domains, sizeof(*d_info));
-- 
2.53.0