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-rw-r--r--tools/perf/util/session.c39
1 files changed, 26 insertions, 13 deletions
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 948327d..64500fc 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -960,6 +960,30 @@ out_err:
return err;
}
+static union perf_event *
+fetch_mmaped_event(struct perf_session *session,
+ u64 head, size_t mmap_size, char *buf)
+{
+ union perf_event *event;
+
+ /*
+ * Ensure we have enough space remaining to read
+ * the size of the event in the headers.
+ */
+ if (head + sizeof(event->header) > mmap_size)
+ return NULL;
+
+ event = (union perf_event *)(buf + head);
+
+ if (session->header.needs_swap)
+ perf_event_header__bswap(&event->header);
+
+ if (head + event->header.size > mmap_size)
+ return NULL;
+
+ return event;
+}
+
int __perf_session__process_events(struct perf_session *session,
u64 data_offset, u64 data_size,
u64 file_size, struct perf_event_ops *ops)
@@ -1014,19 +1038,8 @@ remap:
file_pos = file_offset + head;
more:
- /*
- * Ensure we have enough space remaining to read
- * the size of the event in the headers.
- */
- if (head + sizeof(event->header) > mmap_size)
- goto remap;
-
- event = (union perf_event *)(buf + head);
-
- if (session->header.needs_swap)
- perf_event_header__bswap(&event->header);
-
- if (head + event->header.size > mmap_size) {
+ event = fetch_mmaped_event(session, head, mmap_size, buf);
+ if (!event) {
if (mmaps[map_idx]) {
munmap(mmaps[map_idx], mmap_size);
mmaps[map_idx] = NULL;