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SubjectRe: [PATCH v2 2/3] tracing: Fix parse_synth_field() error handling
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Hi Masami,

On Thu, 2020-10-01 at 14:27 +0900, Masami Hiramatsu wrote:
> Hi Tom,
>
> On Wed, 30 Sep 2020 13:40:51 -0500
> Tom Zanussi <zanussi@kernel.org> wrote:
>
> > synth_field_size() returns either a positive size or an error (zero
> > or
> > a negative value). However, the existing code assumes the only
> > error
> > value is 0. It doesn't handle negative error codes, as it assigns
> > directly to field->size (a size_t; unsigned), thereby interpreting
> > the
> > error code as a valid size instead.
> >
> > Do the test before assignment to field->size.
>
> This looks good to me. And I guess it is a kind of bugfix which
> should be backported?
> (doesn't this need a Fixes tag?)

Yep, thanks for pointing that out.

>
> Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
>

Thanks!

Tom

> Thank you,
>
> >
> > [ axelrasmussen@google.com: changelog addition, first paragraph
> > above ]
> >
> > Signed-off-by: Tom Zanussi <zanussi@kernel.org>
> > ---
> > kernel/trace/trace_events_synth.c | 6 ++++--
> > 1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/kernel/trace/trace_events_synth.c
> > b/kernel/trace/trace_events_synth.c
> > index a9cd7793f7ea..fa8a99828f41 100644
> > --- a/kernel/trace/trace_events_synth.c
> > +++ b/kernel/trace/trace_events_synth.c
> > @@ -465,6 +465,7 @@ static struct synth_field
> > *parse_synth_field(int argc, const char **argv,
> > struct synth_field *field;
> > const char *prefix = NULL, *field_type = argv[0], *field_name,
> > *array;
> > int len, ret = 0;
> > + ssize_t size;
> >
> > if (field_type[0] == ';')
> > field_type++;
> > @@ -520,11 +521,12 @@ static struct synth_field
> > *parse_synth_field(int argc, const char **argv,
> > field->type[len - 1] = '\0';
> > }
> >
> > - field->size = synth_field_size(field->type);
> > - if (!field->size) {
> > + size = synth_field_size(field->type);
> > + if (size <= 0) {
> > ret = -EINVAL;
> > goto free;
> > }
> > + field->size = size;
> >
> > if (synth_field_is_string(field->type))
> > field->is_string = true;
> > --
> > 2.17.1
> >
>
>

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