6.6-stable review patch. If anyone has any objections, please let me know.
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From: Leo Yan leo.yan@arm.com
[ Upstream commit c17dda8013495d8132c976cbf349be9949d0fbd1 ]
If a user specifies an AUX buffer larger than 2 GiB, the returned size may exceed 0x80000000. Since the err variable is defined as a signed 32-bit integer, such a value overflows and becomes negative.
As a result, the perf record command reports an error:
0x146e8 [0x30]: failed to process type: 71 [Unknown error 183711232]
Change the type of the err variable to a signed 64-bit integer to accommodate large buffer sizes correctly.
Fixes: d5652d865ea734a1 ("perf session: Add ability to skip 4GiB or more") Reported-by: Tamas Zsoldos tamas.zsoldos@arm.com Signed-off-by: Leo Yan leo.yan@arm.com Acked-by: Namhyung Kim namhyung@kernel.org Cc: Adrian Hunter adrian.hunter@intel.com Cc: Ian Rogers irogers@google.com Cc: Jiri Olsa jolsa@kernel.org Link: https://lore.kernel.org/r/20250808-perf_fix_big_buffer_size-v1-1-45f45444a9a... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/session.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 277b2cbd51861..e4d57e7df7ae1 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -1662,7 +1662,7 @@ static s64 perf_session__process_user_event(struct perf_session *session, struct perf_tool *tool = session->tool; struct perf_sample sample = { .time = 0, }; int fd = perf_data__fd(session->data); - int err; + s64 err;
if (event->header.type != PERF_RECORD_COMPRESSED || tool->compressed == perf_session__process_compressed_event_stub)