linux-kernel - Re: [PATCH] dyndbg: fix parsing file query without a line-range suffix

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Date:   Thu, 29 Apr 2021 17:08:28 -0400
From:   Jason Baron <jbaron@...mai.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        Shuo Chen <giantchen@...il.com>,
        Jim Cromie <jim.cromie@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Shuo Chen <shuochen@...gle.com>
Subject: Re: [PATCH] dyndbg: fix parsing file query without a line-range
 suffix



On 4/26/21 12:38 PM, Eric Dumazet wrote:
> 
> 
> On 4/14/21 11:24 PM, Shuo Chen wrote:
>> From: Shuo Chen <shuochen@...gle.com>
>>
>> Query like 'file tcp_input.c line 1234 +p' was broken by
>> commit aaebe329bff0 ("dyndbg: accept 'file foo.c:func1' and 'file
>> foo.c:10-100'") because a file name without a ':' now makes the loop in
>> ddebug_parse_query() exits early before parsing the 'line 1234' part.
>> As a result, all pr_debug() in tcp_input.c will be enabled, instead of only
>> the one on line 1234.  Changing 'break' to 'continue' fixes this.
>>
>> Fixes: aaebe329bff0 ("dyndbg: accept 'file foo.c:func1' and 'file foo.c:10-100'")
>> Signed-off-by: Shuo Chen <shuochen@...gle.com>
>> ---
>>  lib/dynamic_debug.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
>> index c70d6347afa2..921d0a654243 100644
>> --- a/lib/dynamic_debug.c
>> +++ b/lib/dynamic_debug.c
>> @@ -396,7 +396,7 @@ static int ddebug_parse_query(char *words[], int nwords,
>>  			/* tail :$info is function or line-range */
>>  			fline = strchr(query->filename, ':');
>>  			if (!fline)
>> -				break;
>> +				continue;
>>  			*fline++ = '\0';
>>  			if (isalpha(*fline) || *fline == '*' || *fline == '?') {
>>  				/* take as function name */
>>
> 
> SGTM, thanks !
> 
> Reviewed-by: Eric Dumazet <edumazet@...gle.com>
> 

Hi Greg,

I acked this previously and is an important fix.
Can you please pick it up if you haven't done so?

Thanks!

-Jason