4.9-stable review patch. If anyone has any objections, please let me know.
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[ 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 mikesart@fastmail.com Reported-by: Mathias Krause minipli@googlemail.com Signed-off-by: Tony Jones tonyj@suse.de Acked-by: Steven Rostedt (VMware) rostedt@goodmis.org Cc: Frederic Weisbecker fweisbec@gmail.com Fixes: f7d82350e597 ("tools/events: Add files to create libtraceevent.a") Link: http://lkml.kernel.org/r/20190228015532.8941-1-tonyj@suse.de Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 669475300ba8..700c74b0aed0 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -2428,7 +2428,7 @@ 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: