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powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH

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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>
This commit is contained in:
Anton Blanchard 2015-04-14 07:51:03 +10:00 committed by Michael Ellerman
parent 7debc970ae
commit 9a5cbce421
1 changed files with 1 additions and 1 deletions
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arch/powerpc/perf/callchain.c
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@ -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;