Commit 224c996e authored by Tony Jones's avatar Tony Jones Committed by Greg Kroah-Hartman

tools lib traceevent: Fix buffer overflow in arg_eval

[ Upstream commit 7c5b019e ]

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.htmlReported-by: default avatarMichael Sartain <mikesart@fastmail.com>
Reported-by: default avatarMathias Krause <minipli@googlemail.com>
Signed-off-by: default avatarTony Jones <tonyj@suse.de>
Acked-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Fixes: f7d82350 ("tools/events: Add files to create libtraceevent.a")
Link: http://lkml.kernel.org/r/20190228015532.8941-1-tonyj@suse.deSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 83c39533
......@@ -2416,7 +2416,7 @@ 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:
......
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