linux-kernel - [PATCH] perf: add sanity check on addr in symbol__inc_addr

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Message-ID: <20120209103016.GA1999@quad>
Date:	Thu, 9 Feb 2012 11:30:16 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	linux-kernel@...r.kernel.org
Cc:	acme@...hat.com, peterz@...radead.org, mingo@...e.hu
Subject: [PATCH] perf: add sanity check on addr in symbol__inc_addr_samples()


Check the value of addr against the bounds of the symbol.
This is needed given we compute an offset:
    	offset = addr - sym->start
    
And we don't want the offset to become negative.
    
Signed-off-by: Stephane Eranian <eranian@...gle.com>

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 011ed26..8248d80 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->end || addr < sym->start)
 		return 0;
 
 	offset = addr - sym->start;
--
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