From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4B8F637A839; Sun, 26 Jul 2026 23:40:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785109240; cv=none; b=WrO7Fwdt+1fLZvD1iS3SRx4QDjM2j1kzvlxaQ2I3XyTVEa/7m2tv6adNrWVH6Ja59eQczb71gA9u1F1UjgiAU+ct9AiEmbpD5Yyg+J8iKlTDyfyizOaoYtAItv4wALzxuGJUMSE1a8vBSp1e3r4QMp3TmPwRxqXtqdPYDlRYyFM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785109240; c=relaxed/simple; bh=lbyJsiQJGx4me0u+KZsKLexHGCnAwuHi3BZFnn+/y2w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ovSe+gZLZS5RAOJsSQz0wRHsB/Zl3jCROGUYPzImjGTM1hmfUOv8ggiBxJAljcm4OP14RAiHfG+46qVgdVq07bI18e6zrNLewbSKMrXL5ofv/p3v71ftrBRx/LBT+CrbVn4YlultiLhMq8fiXq5fV9jWpg0OqZznsqEPPGqthyI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=F0oWRyQK; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="F0oWRyQK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56E311F000E9; Sun, 26 Jul 2026 23:40:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785109239; bh=DCUV+6Q8/lKkSU+cwx/yfOl4ZDL0agOPyBwzyHEvM2I=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=F0oWRyQKRlHg91/Dy0rTchkwS9M+XSozv3I0pMyKSocR9AiwhrTnK2fEHe35QZuue voWFLMAbzs0UbgIrW7p/HSyr8Zi87dOhk4Zi3907RmD3ApInOB+GMm6SnMwG2SzJlF 44MS55hCdmnTNgCRy01kgWd+ZkjN6vf6LpUMsvdQPd7yMntV4PRcF0EQhaJQedhbGn 5UvyXm6Tu7XQ++jJCioZ9UXdySLI1b32y7Em2BB3USYm9ydfRWr99LTyYNSTqsHzRG dJ/xaPnZPs5JjzH4XSpMTJVy9v2mdIjQXdqJaYbokVqg4glWlW4HXGb/zx/zOcalj0 G7H758q9/w+yA== From: Arnaldo Carvalho de Melo To: Namhyung Kim Cc: Ingo Molnar , Thomas Gleixner , James Clark , Jiri Olsa , Ian Rogers , Adrian Hunter , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , sashiko-bot , "Zhang, Yanmin" Subject: [PATCH 6/8] perf machine: Reset errno before strtol in guest kernel map creation Date: Sun, 26 Jul 2026 20:40:12 -0300 Message-ID: <20260726234014.63111-7-acme@kernel.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260726234014.63111-1-acme@kernel.org> References: <20260726234014.63111-1-acme@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Arnaldo Carvalho de Melo machines__create_guest_kernel_maps() checks errno == ERANGE after strtol() to detect overflow, but does not clear errno first. A stale ERANGE from an earlier library call (e.g. scandir internals) causes valid numeric directory names to be incorrectly skipped. Set errno = 0 before strtol() so only the current conversion can trigger the ERANGE check. Fixes: a1645ce12adb ("perf: 'perf kvm' tool for monitoring guest performance from host") Reported-by: sashiko-bot Cc: Zhang, Yanmin Assisted-by: Claude:claude-opus-4.6 Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/machine.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 83d38637afe34fc9..1700130adedb3a89 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -1258,6 +1258,7 @@ int machines__create_guest_kernel_maps(struct machines *machines) /* Filter out . and .. */ continue; } + errno = 0; pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10); if ((*endp != '\0') || (endp == namelist[i]->d_name) || -- 2.55.0