[ Upstream commit 7c5b019e3a638a5a290b0ec020f6ca83d2ec2aaa ] Fix buffer overflow observed when running perf test.
The overflow is when trying to evaluate "1ULL << (64 - 1)" which is resulting in -9223372036854775808 which overflows the 20 character buffer. If is possible this bug has been reported before but I still don't see any fix checked in: See: https://www.spinics.net/lists/linux-perf-users/msg07714.html Reported-by: Michael Sartain <[email protected]> Reported-by: Mathias Krause <[email protected]> Signed-off-by: Tony Jones <[email protected]> Acked-by: Steven Rostedt (VMware) <[email protected]> Cc: Frederic Weisbecker <[email protected]> Fixes: f7d82350e597 ("tools/events: Add files to create libtraceevent.a") Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- tools/lib/traceevent/event-parse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index 0c81ca7d18cd..84374e313e3f 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -2283,7 +2283,7 @@ static int arg_num_eval(struct print_arg *arg, long long *val) static char *arg_eval (struct print_arg *arg) { long long val; - static char buf[20]; + static char buf[24]; switch (arg->type) { case PRINT_ATOM: -- 2.19.1
