From: Tony Jones <tonyj@xxxxxxx>
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@xxxxxxxxxxxx>
Reported-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Signed-off-by: Tony Jones <tonyj@xxxxxxx>
Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Fixes: f7d82350e597 ("tools/events: Add files to create libtraceevent.a")
Link: http://lkml.kernel.org/r/20190228015532.8941-1-tonyj@xxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
[
Backport from kernel into the trace-cmd repo.
]
lib/traceevent/event-parse.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/traceevent/event-parse.c b/lib/traceevent/event-parse.c
index 7cb2ae4..b36b536 100644
--- a/lib/traceevent/event-parse.c
+++ b/lib/traceevent/event-parse.c
@@ -2456,7 +2456,7 @@ static int arg_num_eval(struct tep_print_arg *arg, long long *val)
static char *arg_eval (struct tep_print_arg *arg)
{
long long val;
- static char buf[20];
+ static char buf[24];
switch (arg->type) {
case TEP_PRINT_ATOM:
--
2.21.0
|