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 6390C19D8BC; Sat, 12 Sep 2026 10:37:18 +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=1789209439; cv=none; b=qiSOVQrXm+TxQohR02DbVWv7cWQ12sZV4ybTiricUwdmcwZJr8O502j3mJZTVqWxeCVpQF8tg1W6WyhUbRh4EqPIqM3xLpty0pkDeyGCcQcQ/VYKyHyD/Txnvw9JXbXa/h6XhkmpUZiZ5SWF3sYM8EoJuDKHSGeWIUEj1TpJB7k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789209439; c=relaxed/simple; bh=kr/HpEklYr030ggN1RFrzAH2zexjxvHW9fRfJaousd0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=B87a6uBLceUz37yt4pr+rm3YszS6GfuJvAAq1imrBp3tTp0zpYbDoePXJQxzbq06QjCMFWAV6QHHhe8oLraMf8PDxpsalhJzK7To0mMlIzK+fqlN8bEjWyktGstkvyVQwGsCEer81E4Igds2EtJ3NE5SaftyLDKWU887mMuuTxs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LdSQt2Dc; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="LdSQt2Dc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1F1AC1F000FF; Sat, 12 Sep 2026 10:37:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789209438; bh=1JxvbaJqR7u1xtzmQ7XSSYw2PWormdyWgP1Wyi0rkDE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LdSQt2Dc+aQmmY8THY+r7QGEMB7l7EvCEBUTQYd7siqFh7J1V79HCRmEefqinpsTi lrzNsBzB/ZetEWn4NoxEUOrDtvF4JIJUeCILFspn9B1s6+4oJvyV2L6dKqMk+4mmZJ H7rfFilDqdTlG9xp7JLKzE0UT2Nz3HenoIRjldxI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, sashiko-bot , "Zhang, Yanmin" , Arnaldo Carvalho de Melo , Namhyung Kim , Sasha Levin Subject: [PATCH 6.18 0784/1518] perf machine: Reset errno before strtol in guest kernel map creation Date: Sat, 12 Sep 2026 08:49:13 +0200 Message-ID: <20260912065641.173309971@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065623.398859879@linuxfoundation.org> References: <20260912065623.398859879@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Arnaldo Carvalho de Melo [ Upstream commit 29ec46e43f6ca7d6a6651db724d4ffd820f46e8b ] 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 Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin --- 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 b35c73618ea02..7489bc84a3d39 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -1237,6 +1237,7 @@ 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) || -- 2.53.0