[PATCH] perf: add sanity check on addr in symbol__inc_addr_samples()

[Stephane Eranian]

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@xxxxxxxxxx>

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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