linux-kernel - Re: [PATCH 3/3] perf annotate: Fix segfault with source toggle

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Date:   Mon, 20 Jan 2020 18:20:49 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     acme@...nel.org, namhyung@...nel.org, irogers@...gle.com,
        songliubraving@...com, yao.jin@...ux.intel.com,
        linux-kernel@...r.kernel.org,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [PATCH 3/3] perf annotate: Fix segfault with source toggle



On 1/20/20 3:42 PM, Jiri Olsa wrote:
> On Fri, Jan 17, 2020 at 02:56:12PM +0530, Ravi Bangoria wrote:
>> While rendering annotate browser from perf report tui, we keep track
>> of total number of lines(asm + source) in annotation->nr_entries and
>> total number of asm lines in annotation->nr_asm_entries. But we don't
>> reset them before starting. Thus if user annotates same function
>> multiple times, we restart incrementing these fields with old values.
>>
>> This causes a segfault when user tries to toggle source code after
>> annotating same function multiple times. Fix it.
>>
>> Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
>> ---
>>   tools/perf/util/annotate.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
>> index fe98d29dfbc4..df09c2070337 100644
>> --- a/tools/perf/util/annotate.c
>> +++ b/tools/perf/util/annotate.c
>> @@ -2610,6 +2610,8 @@ void annotation__set_offsets(struct annotation *notes, s64 size)
>>   	struct annotation_line *al;
>>   
>>   	notes->max_line_len = 0;
>> +	notes->nr_entries = 0;
>> +	notes->nr_asm_entries = 0;
> 
> seems fair ;-)
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>

Thanks!

> 
> also could you please make that function static (in separate change)
> in your next repost?

Sure will do.

- Ravi