Commit a7cc9100 authored Jul 07, 2014 by Jean Pihet Committed by Will Deacon Jul 09, 2014

ARM: perf: Check that current->mm is alive before getting user callchain



An event may occur when an mm is already released.

As per commit 20afc60f
 'x86, perf: Check that current->mm is alive before getting user callchain'

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jean Pihet <jean.pihet@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

parent 037e79aa

arch/arm/kernel/perf_event.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -590,6 +590,10 @@ perf_callchain_user(struct perf_callchain_entry entry, struct pt_regs regs)
		}

		perf_callchain_store(entry, regs->ARM_pc);

		if (!current->mm)
		return;

		tail = (struct frame_tail __user *)regs->ARM_fp - 1;

		while ((entry->nr < PERF_MAX_STACK_DEPTH) &&