Re: KASAN: use-after-free Read in rds_tcp_tune

Dmitry Vyukov
2018-02-14T17:17:10Z

On Wed, Feb 14, 2018 at 6:02 PM, Joe Perches <joe@perches.com> wrote:
> On Wed, 2018-02-14 at 16:55 +0100, Dmitry Vyukov wrote:
>> On Wed, Feb 14, 2018 at 4:35 PM, Sowmini Varadhan <sowmini.varadhan@oracle.com> wrote:
>> > btw, checkpatch.pl complains about the syzbot*@syzkaller.appspotmail.com
>> > addresses as "Unrecognized email address", we should fix that
>> > error from checkpatch at some point.
>>
>> Interesting. Looking at checkpatch.pl I think it wants all addresses
>> to be in <>, i.e.
>> Reported-by: <syzbot+bbd8e9a06452cc48059b@syzkaller.appspotmail.com>
>> There probably was some reason to enforce this, so I think I will
>> change the syzbot email template to include <>.
>> Thanks!
>
> Not really.
>
> It's the somewhat unusual + in the address
> that perl needs quoted before a substitution.
>
> I believe this fixes it in checkpatch.
> ---
> scripts/checkpatch.pl | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 3d4040322ae1..2b8397da39d3 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -1075,7 +1075,7 @@ sub parse_email {
> } elsif ($formatted_email =~ /(\S+\@\S+)(.*)$/) {
> $address = $1;
> $comment = $2 if defined $2;
> - $formatted_email =~ s/$address.*$//;
> + $formatted_email =~ s/\Q$address\E.*$//;
> $name = $formatted_email;
> $name = trim($name);
> $name =~ s/^\"|\"$//g;

I can confirm that running
$ git show HEAD | scripts/checkpatch.pl -
on a commit that contains a syzbot Reported-by tag does not produce
the warning anymore.

Joe, do you mind mailing this as patch?