linux-kernel - [tip:x86/asm] perf/x86: Check perf_callchain

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Date:   Thu, 8 Sep 2016 02:48:16 -0700
From:   tip-bot for Josh Poimboeuf <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     keescook@...omium.org, peterz@...radead.org, tglx@...utronix.de,
        luto@...capital.net, rostedt@...dmis.org, brgerst@...il.com,
        hpa@...or.com, linux-kernel@...r.kernel.org, nilayvaish@...il.com,
        jpoimboe@...hat.com, mingo@...nel.org,
        torvalds@...ux-foundation.org, byungchul.park@....com,
        fweisbec@...il.com
Subject: [tip:x86/asm] perf/x86: Check perf_callchain_store() error

Commit-ID:  019e579d395733d14097c2d29c8c43226dad1617
Gitweb:     http://git.kernel.org/tip/019e579d395733d14097c2d29c8c43226dad1617
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Wed, 24 Aug 2016 11:50:14 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 8 Sep 2016 08:58:40 +0200

perf/x86: Check perf_callchain_store() error

Add a check to perf_callchain_kernel() so that it returns early if the
callchain entry array is already full.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Byungchul Park <byungchul.park@....com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Nilay Vaish <nilayvaish@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/dce6d60bab08be2600efd90021d9b85620646161.1472057064.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index d0efb5c..c1319ac 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2277,7 +2277,8 @@ perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *re
 		return;
 	}
 
-	perf_callchain_store(entry, regs->ip);
+	if (perf_callchain_store(entry, regs->ip))
+		return;
 
 	dump_trace(NULL, regs, NULL, 0, &backtrace_ops, entry);
 }