Commit 9a5cbce4 authored Apr 14, 2015 by Anton Blanchard Committed by Michael Ellerman Apr 14, 2015

powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH



We cap 32bit userspace backtraces to PERF_MAX_STACK_DEPTH
(currently 127), but we forgot to do the same for 64bit backtraces.

Cc: stable@vger.kernel.org
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

parent 7debc970

arch/powerpc/perf/callchain.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -243,7 +243,7 @@ static void perf_callchain_user_64(struct perf_callchain_entry *entry,
		sp = regs->gpr[1];
		perf_callchain_store(entry, next_ip);

		for (;;) {
		while (entry->nr < PERF_MAX_STACK_DEPTH) {
		fp = (unsigned long __user *) sp;
		if (!valid_user_sp(sp, 1) \|\| read_user_stack_64(fp, &next_sp))
		return;