From b314e5cfd11fd78545ce6c2be42646254390c1aa Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Mon, 30 Sep 2013 17:19:48 +0900 Subject: perf session: Fix infinite loop on invalid perf.data file perf-record updates the header in the perf.data file at termination. Without this update perf-report (and other processing built-ins) it caused an infinite loop when perf report (or something like) called. This is because the algorithm in __perf_session__process_events() depends on the data_size which is read from file header. Use file size directly instead in this case to do the best-effort processing. Signed-off-by: Namhyung Kim Tested-by: David Ahern Tested-by: Sonny Rao Acked-by: Ingo Molnar Cc: David Ahern Cc: Ingo Molnar Cc: Jiri Olsa Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Sonny Rao Link: http://lkml.kernel.org/r/1380529188-27193-1-git-send-email-namhyung@kernel.org Signed-off-by: David Ahern [ Reworded warning as per Ingo Molnar suggestion, replaces 'perf.data' with session->filename, to precisely identify the data file involved ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/session.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'tools/perf/util/session.c') diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 37c4718f6be1..568b750c01f6 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -1312,7 +1312,7 @@ int __perf_session__process_events(struct perf_session *session, file_offset = page_offset; head = data_offset - page_offset; - if (data_offset + data_size < file_size) + if (data_size && (data_offset + data_size < file_size)) file_size = data_offset + data_size; progress_next = file_size / 16; -- cgit v1.2.3-55-g7522