From nobody Mon Feb 9 21:18:51 2026 Received: from mail-dl1-f73.google.com (mail-dl1-f73.google.com [74.125.82.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DA3ED378D9F for ; Tue, 3 Feb 2026 22:51:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.73 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770159107; cv=none; b=Rwe3ZpHONeqNAX7ksLeVbSybyXyVM6HFXR8a45GkH/ECJf9nPpo/uWKkO9VpTYjQY6pY0glQVR7z1oT8nPl9Bp43EnFrqN4Nys4ucQj0/v1F2QL7FZ2DVpJ1oTqZK5oNz0Ad6c3qH5Kw7AcdNW9BW34Qn2n42a7jLCWv+9jNAuw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770159107; c=relaxed/simple; bh=y3Mk9sAgkuN3mOITzM5MtblmDiqpA0EdmXDSE+EyzZQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Content-Type; b=K5LvYUVM0P0UxBboRTlUKgmGYznNbYvYjdroSWGLsxXKQK+EuitsDxkeJqUS6zNwR9NZiH0W3VZSbUZr2nQ8HSF8EDYZy4tcFQ7J/ll3GEXdybLksEFH+6XbVBCQc8nM59LUWrZU0j/FlJXDoXmjpHO28dZKL3UPpsUe6iCazSU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=ayvevPY+; arc=none smtp.client-ip=74.125.82.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ayvevPY+" Received: by mail-dl1-f73.google.com with SMTP id a92af1059eb24-1233b91de6bso10752227c88.1 for ; Tue, 03 Feb 2026 14:51:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1770159105; x=1770763905; darn=vger.kernel.org; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=zzsKRSqRCFvt6FoeMViytQ7VfwZPfcB23PzvAjYa0/g=; b=ayvevPY+tMIRfl/1yZkq+4CslQjsNa9mK2TDULJfMqhvyyIv98GnTVr84nNE6iHD4S lzjcvBMgK0cdV1+1rkhjX9GMTYKDisaTnW8V+jYZv283imyJS5i6sePRQhRtEBjBFpmI rDtkH1JyWPCJ3rLDHVNVawn9O7PX66FU1iQqWhpMN2Qfb/Xu3PhwrzHfzzMNpuawnKqP 8b3R0oR16uuHbGGKop6YoUXiiyzKAMyslSgYIzXET1qxE8quliE6TO9KYVNnXiql8M66 Q+S/F8TvXxsB4ZMcfo+Rq1G2Kp2MyNRt3hmbJv5FIYKLfsUG8jJl+gEfsRDTl4lGBpRk JvUQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770159105; x=1770763905; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=zzsKRSqRCFvt6FoeMViytQ7VfwZPfcB23PzvAjYa0/g=; b=Rpyg3zwtsq62m25l4Cuup+1nTSfJZnsS5wzGF8WIz+qibN1j8/QSfahayDhm84NMkT eLQS5roF29HaWn6WktCXHTNUnPEtRPPeCYLvVonVl1KUhjdIEKH3yxiBSN/O26ty7h9H IJRPmWOJa25XfdNkVsjq/sIe9gA2RhujylDbjkjWdF/tsQTNGsAzIeXao4MME4s/JZGc Qf0ox/TUllqH9Mn1ZjtkwDxVF2YweeDko1jug6gxOLpEjDmGugv6KOjIdWDtd6i7XJjX iiyus1ImA3ovZUNaG6mJB3YrtYwFc2slIMlPzQNlLj+B1JE9ZbMcBn65o3Rm3dbkYj1P 8djA== X-Forwarded-Encrypted: i=1; AJvYcCWT+MNy6gGxEGGjD5qqNjIJTNYXIx301Tut9C3UT5qDGnEbtWr8FQReVXlAnn2LopcI5No8o1qFqZhfNUY=@vger.kernel.org X-Gm-Message-State: AOJu0YwOg1GkxzWamx1xAiqqWI9krsIx1DxHmPzThjUBSjXzZtzAoeXN 295kc9Za6IsQzRw/Udww68a+LaIT7cQePVqDgKj0q/iWCDDHWwFgKaQm6Oe9wrriKNzWqTJTRJC 1cVLJH2lxHw== X-Received: from dlbsn10.prod.google.com ([2002:a05:7022:b90a:b0:126:d3ab:7af6]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7022:6892:b0:11b:c1fb:89a with SMTP id a92af1059eb24-126f47cbf2dmr456724c88.32.1770159104993; Tue, 03 Feb 2026 14:51:44 -0800 (PST) Date: Tue, 3 Feb 2026 14:51:25 -0800 In-Reply-To: <20260203225129.4077140-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260203225129.4077140-1-irogers@google.com> X-Mailer: git-send-email 2.53.0.rc2.204.g2597b5adb4-goog Message-ID: <20260203225129.4077140-3-irogers@google.com> Subject: [PATCH v7 2/6] perf stat-shadow: In prepare_metric fix guard on reading NULL perf_stat_evsel From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Dr. David Alan Gilbert" , Yang Li , James Clark , Thomas Falcon , Thomas Richter , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, Andi Kleen , Dapeng Mi , Andres Freund Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The aggr value is setup to always be non-null creating a redundant guard for reading from it. Switch to using the perf_stat_evsel (ps) and narrow the scope of aggr so that it is known valid when used. Reported-by: Andres Freund Closes: https://lore.kernel.org/linux-perf-users/cgja46br2smmznxs7kbeabs6zg= v3b4olfqgh2fdp5mxk2yom4v@w6jjgov6hdi6/ Fixes: 3d65f6445fd9 ("perf stat-shadow: Read tool events directly") Signed-off-by: Ian Rogers --- tools/perf/util/stat-shadow.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c index 9c83f7d96caa..7a481b2960a5 100644 --- a/tools/perf/util/stat-shadow.c +++ b/tools/perf/util/stat-shadow.c @@ -57,7 +57,6 @@ static int prepare_metric(struct perf_stat_config *config, bool is_tool_time =3D tool_pmu__is_time_event(config, metric_events[i], &tool_aggr_idx); struct perf_stat_evsel *ps =3D metric_events[i]->stats; - struct perf_stat_aggr *aggr; char *n; double val; =20 @@ -82,8 +81,7 @@ static int prepare_metric(struct perf_stat_config *config, } } /* Time events are always on CPU0, the first aggregation index. */ - aggr =3D &ps->aggr[is_tool_time ? tool_aggr_idx : aggr_idx]; - if (!aggr || !metric_events[i]->supported) { + if (!ps || !metric_events[i]->supported) { /* * Not supported events will have a count of 0, which * can be confusing in a metric. Explicitly set the @@ -93,6 +91,9 @@ static int prepare_metric(struct perf_stat_config *config, val =3D NAN; source_count =3D 0; } else { + struct perf_stat_aggr *aggr =3D + &ps->aggr[is_tool_time ? tool_aggr_idx : aggr_idx]; + val =3D aggr->counts.val; if (is_tool_time) val *=3D 1e-9; /* Convert time event nanoseconds to seconds. */ --=20 2.53.0.rc2.204.g2597b5adb4-goog