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Commit 540804b5 authored by Stephane Eranian's avatar Stephane Eranian Committed by Ingo Molnar
Browse files

perf_events: Fix invalid pointer when pid is invalid 



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: default avatarStephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: paulus@samba.org
Cc: davem@davemloft.net
Cc: fweisbec@gmail.com
Cc: perfmon2-devel@lists.sf.net
Cc: eranian@gmail.com
Cc: robert.richter@amd.com
LKML-Reference: <4ca9a5d1.e8e9d80a.3dbb.ffff8f2e@mx.google.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent d6dad199

kernel/perf_event.c

+6 −1
Original line number Original line Diff line number Diff line
@@ -5616,8 +5616,13 @@ SYSCALL_DEFINE5(perf_event_open, 
		}

		}

	}

	}





	if (pid != -1)

	if (pid != -1) {

		task = find_lively_task_by_vpid(pid);

		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):

	 * Get the target context (task or percpu):