linux-kernel - [PATCH] perf: check if address is in range

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Date:	Thu, 12 Jan 2012 22:55:49 +0200
From:	Sorin Dumitru <dumitru.sorin87@...il.com>
To:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	acme@...stprotocols.net
Cc:	Sorin Dumitru <dumitru.sorin87@...il.com>
Subject: [PATCH] perf: check if address is in range

When addr isn't in the [sym->start,sym->end] range offset
will be a very big value, giving us a segfault when we do:
	h->addr[offset]++
Fix this by checking that addr is in the correct range.

Signed-off-by: Sorin Dumitru <dumitru.sorin87@...il.com>
---
 tools/perf/util/annotate.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 011ed26..59aa456 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -64,7 +64,7 @@ int symbol__inc_addr_samples(struct symbol *sym, struct map *map,
 
 	pr_debug3("%s: addr=%#" PRIx64 "\n", __func__, map->unmap_ip(map, addr));
 
-	if (addr >= sym->end)
+	if (addr < sym->start || addr >= sym->end)
 		return 0;
 
 	offset = addr - sym->start;
-- 
1.7.8.3

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