[PATCH] perf: fix infinite loop with corrupted header

[Sonny Rao]

We recently ran into a corrupt perf data file which mostly looked okay
but the section size for data was set to 0.  This caused perf report to
get into an infinite loop in __perf_session_process_events().  Let's
just avoid this by bailing early and reporting it if there's an
invalid header.

Signed-off-by: Sonny Rao <sonnyrao@xxxxxxxxxxxx>
---
 tools/perf/util/header.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 26441d0..085ef76 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2582,6 +2582,10 @@ int perf_file_header__read(struct perf_file_header *header,
 	ph->data_offset  = header->data.offset;
 	ph->data_size	 = header->data.size;
 	ph->feat_offset  = header->data.offset + header->data.size;
+
+	if (!header->data.size)
+		die("corrupted header, invalid size 0 for data section\n");
+
 	return 0;
 }
 
-- 
1.8.4

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