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

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Message-ID: <YIuY3GtRa1mO9/BG@kroah.com>
Date:   Fri, 30 Apr 2021 07:42:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Jason Baron <jbaron@...mai.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Shuo Chen <giantchen@...il.com>,
        Jim Cromie <jim.cromie@...il.com>,
        linux-kernel@...r.kernel.org, Shuo Chen <shuochen@...gle.com>
Subject: Re: [PATCH] dyndbg: fix parsing file query without a line-range
 suffix

On Thu, Apr 29, 2021 at 05:08:28PM -0400, Jason Baron wrote:
> 
> 
> 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?

Will do, sorry for the delay.

greg k-h