[PATCH 4/5] perf intel-bts: Fix off-by-one in auxtrace_info minimum size check

[Arnaldo Carvalho de Melo]

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

Same pattern as the Intel PT fix: min_sz is set to
sizeof(u64) * INTEL_BTS_SNAPSHOT_MODE, but the code accesses
auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE], which requires at least
INTEL_BTS_SNAPSHOT_MODE + 1 elements.

Use (INTEL_BTS_SNAPSHOT_MODE + 1) to ensure the highest accessed index
is within bounds.

Fixes: d0170af7004dce9c ("perf tools: Add Intel BTS support")
Reported-by: sashiko-bot <sashiko-bot@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/intel-bts.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/intel-bts.c b/tools/perf/util/intel-bts.c
index 0b18ebd13f7c8456..02df3e46048912eb 100644
--- a/tools/perf/util/intel-bts.c
+++ b/tools/perf/util/intel-bts.c
@@ -830,7 +830,7 @@ int intel_bts_process_auxtrace_info(union perf_event *event,
 				    struct perf_session *session)
 {
 	struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info;
-	size_t min_sz = sizeof(u64) * INTEL_BTS_SNAPSHOT_MODE;
+	size_t min_sz = sizeof(u64) * (INTEL_BTS_SNAPSHOT_MODE + 1);
 	struct intel_bts *bts;
 	int err;
 
-- 
2.55.0