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powerpc/perf: Cap 64bit userspace backtraces to PERF_MAX_STACK_DEPTH

PATCH New Anton Blanchard 1 participant 1 message Apr 13, 2015 PowerPC

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Anton Blanchard

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PATCH 1/1 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 [email protected]
Signed-off-by Anton Blanchard <[email protected]>
---
 arch/powerpc/perf/callchain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
arch/powerpc/perf/callchain.c +1 -1
index 2396dda..ead5535 100644
@@ -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;
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