From: Stephane Eranian <eranian@google.com>
To: linux-kernel@vger.kernel.org
Cc: peterz@infradead.org, mingo@elte.hu, paulus@samba.org,
davem@davemloft.net, fweisbec@gmail.com,
perfmon2-devel@lists.sf.net, eranian@gmail.com,
eranian@google.com, robert.richter@amd.com
Subject: [PATCH] perf_events: fix invalid pointer when pid is invalid
Date: Mon, 4 Oct 2010 12:00:02 +0200 [thread overview]
Message-ID: <4ca9a5d1.e8e9d80a.3dbb.ffff8f2e@mx.google.com> (raw)
This patch fixes an error in perf_event_open() when the pid
provided by the user is invalid. find_lively_task_by_vpid()
does not return NULL on error but an error code. Without the
fix the error code was silently passed to find_get_context()
which would eventually cause a invalid pointer dereference.
Signed-off-by: Stephane Eranian <eranian@google.com>
---
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index c16158c..64507ea 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -5616,8 +5616,13 @@ SYSCALL_DEFINE5(perf_event_open,
}
}
- if (pid != -1)
+ if (pid != -1) {
task = find_lively_task_by_vpid(pid);
+ if (IS_ERR(task)) {
+ err = PTR_ERR(task);
+ goto err_group_fd;
+ }
+ }
/*
* Get the target context (task or percpu):
next reply other threads:[~2010-10-04 10:00 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-04 10:00 Stephane Eranian [this message]
2010-10-04 20:35 ` [tip:perf/core] perf_events: Fix invalid pointer when pid is invalid tip-bot for Stephane Eranian
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