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

From: Greg Kroah-Hartman
Date: Fri Apr 30 2021 - 01:43:02 EST


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@xxxxxxxxxx>
> >>
> >> 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@xxxxxxxxxx>
> >> ---
> >> 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@xxxxxxxxxx>
> >
>
> 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