[PATCH 23/27] selftests/landlock: Fix stale comments in common.h and audit.h

[Günther Noack]

* _init_caps() lists more than three capabilities.
* A 64-bit hexadecimal domain ID has at most 16 digits, not 17.  Size
  the buffer accordingly and drop a redundant domain_id check in
  audit_match_record().

Assisted-by: LLM
Signed-off-by: Günther Noack <gnoack3000 at gmail.com>
---
 tools/testing/selftests/landlock/audit.h  | 7 +++----
 tools/testing/selftests/landlock/common.h | 2 +-
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/landlock/audit.h b/tools/testing/selftests/landlock/audit.h
index 173dcd1088db..d23bb2ad3a30 100644
--- a/tools/testing/selftests/landlock/audit.h
+++ b/tools/testing/selftests/landlock/audit.h
@@ -274,15 +274,14 @@ static int audit_match_record(int audit_fd, const __u16 type,
 		*domain_id = 0;
 		if (matches[1].rm_so != -1) {
 			int match_len = matches[1].rm_eo - matches[1].rm_so;
-			/* The maximal characters of a 2^64 hexadecimal number is 17. */
-			char dom_id[18];
+			/* A 64-bit hexadecimal number has at most 16 digits. */
+			char dom_id[17];
 
 			if (match_len > 0 && match_len < sizeof(dom_id)) {
 				memcpy(dom_id, msg.data + matches[1].rm_so,
 				       match_len);
 				dom_id[match_len] = '\0';
-				if (domain_id)
-					*domain_id = strtoull(dom_id, NULL, 16);
+				*domain_id = strtoull(dom_id, NULL, 16);
 			}
 		}
 	}
diff --git a/tools/testing/selftests/landlock/common.h b/tools/testing/selftests/landlock/common.h
index ae6a0eb8e343..f0e8d3a498b3 100644
--- a/tools/testing/selftests/landlock/common.h
+++ b/tools/testing/selftests/landlock/common.h
@@ -34,7 +34,7 @@ static const char bin_wait_pipe_sandbox[] = "./wait-pipe-sandbox";
 static void _init_caps(struct __test_metadata *const _metadata, bool drop_all)
 {
 	cap_t cap_p;
-	/* Only these three capabilities are useful for the tests. */
+	/* Only these capabilities are useful for the tests. */
 	const cap_value_t caps[] = {
 		/* clang-format off */
 		CAP_AUDIT_CONTROL,
-- 
2.56.0