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

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Message-ID: <CAB6DaTNSGtbgdbeg0MUK44MM1xfcA6HgNCCxJ4Ownat87Gnr_A@mail.gmail.com>
Date:	Thu, 12 Jan 2012 22:59:47 +0200
From:	Sorin Dumitru <dumitru.sorin87@...il.com>
To:	Daniel Baluta <dbaluta@...acom.com>
Cc:	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	acme@...stprotocols.net
Subject: Re: [PATCH] perf: check if address is in range

On Thu, Jan 12, 2012 at 10:49 PM, Daniel Baluta <dbaluta@...acom.com> wrote:
> On Thu, Jan 12, 2012 at 10:39 PM, Sorin Dumitru
> <dumitru.sorin87@...il.com> wrote:
>> 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..4ddc55f 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;
>
> Shouldn't this be addr < sym->start ?
>
> thanks,
> Daniel.

You're right, i resent the patch.

Thanks,
Sorin
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