linux-kernel - [tip:perf/urgent] perf session: Fix infinite loop in __perf_session__process

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Date:	Tue, 11 Jan 2011 11:11:46 GMT
From:	tip-bot for Arnaldo Carvalho de Melo <acme@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, paulus@...ba.org,
	acme@...hat.com, hpa@...or.com, mingo@...hat.com,
	tzanussi@...il.com, torvalds@...ux-foundation.org,
	peterz@...radead.org, efault@....de, fweisbec@...il.com,
	tglx@...utronix.de, daahern@...co.com, mingo@...e.hu
Subject: [tip:perf/urgent] perf session: Fix infinite loop in __perf_session__process_events

Commit-ID:  3d03e2ea74103a50c23d6ab1906cf73399c0dafb
Gitweb:     http://git.kernel.org/tip/3d03e2ea74103a50c23d6ab1906cf73399c0dafb
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Mon, 10 Jan 2011 21:37:57 -0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 10 Jan 2011 22:23:08 -0200

perf session: Fix infinite loop in __perf_session__process_events

In this if statement:

        if (head + event->header.size >= mmap_size) {
                if (mmaps[map_idx]) {
                        munmap(mmaps[map_idx], mmap_size);
                        mmaps[map_idx] = NULL;
                }

                page_offset = page_size * (head / page_size);
                file_offset += page_offset;
                head -= page_offset;
                goto remap;
        }

With, for instance, these values:

head=2992
event->header.size=48
mmap_size=3040

We end up endlessly looping back to remap. Off by one.

Problem introduced in 55b4462.

Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Reported-by: Ingo Molnar <mingo@...e.hu>
Reported-by: David Ahern <daahern@...co.com>
Bisected-by: David Ahern <daahern@...co.com>
Tested-by: David Ahern <daahern@...co.com>
Cc: David Ahern <daahern@...co.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tom Zanussi <tzanussi@...il.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/session.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 6fb4694..313dac2 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1007,7 +1007,7 @@ more:
 	if (size == 0)
 		size = 8;
 
-	if (head + event->header.size >= mmap_size) {
+	if (head + event->header.size > mmap_size) {
 		if (mmaps[map_idx]) {
 			munmap(mmaps[map_idx], mmap_size);
 			mmaps[map_idx] = NULL;
--
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