From patchwork Tue Dec 5 15:36:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Philipp Stanner X-Patchwork-Id: 13480335 X-Patchwork-Delegate: bhelgaas@google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="aTpJmBIK" Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE79383 for ; Tue, 5 Dec 2023 07:38:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1701790686; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=NoDK23LlK5p4IgH6ZTqMMZELxs6CauTLQ4NGvi9HnM4=; b=aTpJmBIK8PwgvktqOAM7SfZxJ06lLy6DnGsShEorVazYcoLGOdXuUqE5OPnTLjMrqGTjPk HSxr8F3QJMBFCuvVRxG8ksE6mc4BKG4b+jfyNylTr6G8A4C17+G+mv9/0k+BqodY+p/uDH WFhaipFWNMG1yaZ8oCv6ICekSwnSwiI= Received: from mail-ed1-f71.google.com (mail-ed1-f71.google.com [209.85.208.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-168-OksBZoCdNPKoSsZrnns7Sw-1; Tue, 05 Dec 2023 10:37:55 -0500 X-MC-Unique: OksBZoCdNPKoSsZrnns7Sw-1 Received: by mail-ed1-f71.google.com with SMTP id 4fb4d7f45d1cf-54cc6ae088bso134871a12.1 for ; Tue, 05 Dec 2023 07:37:55 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701790673; x=1702395473; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=NoDK23LlK5p4IgH6ZTqMMZELxs6CauTLQ4NGvi9HnM4=; b=ZgFbKWY1h0nWrHJVEuploh3gvGfHhY7YgNT9JoYWX1xULx5oKpuH9XMJmGDs5RuTBn NJXKBvJseuENI4Qq2yH8rB6/J1BGQcfLBCu03d+bZ4aHcgPrFD5GJEnz83cliphQy0RV AhvvPwrCNz2OxSBw6Qso82DlqHk9ceg5caH6GkczrtfzczhrmhKAJL66qAf3lvy3JY78 SlzyYJLaxZsbUaMilaB+Jhv9XW09fsY3tytq2GdJMeW85Q2euFcTLvQE7pHhawipMf1f D4I518r8K20g088pHG+ybIP6kxDlNJ9JDGoWv06+hU9VYTRVtV+/B8x4O+wF2diPWKPk Buaw== X-Gm-Message-State: AOJu0YyYoqn8WjyqH1JUEUO3rzLTQYUppWKbM7ss5kDk/pSrgXH3Blwm Nhdmu096mj7Ph/sL7MrfuX6I9JTFg7z1EsjewXa60dSV6zs1N+kPQanyHpQdBr+wNfoTT0QPoKo jh0EDFK7QeT8BJ0GuHo6S X-Received: by 2002:a05:6402:1d0e:b0:54d:2efd:369e with SMTP id dg14-20020a0564021d0e00b0054d2efd369emr1100570edb.1.1701790673581; Tue, 05 Dec 2023 07:37:53 -0800 (PST) X-Google-Smtp-Source: AGHT+IHMWm/1bFBFbNN6jWtOQ+6Wi9ETG9A4NbaILiBypRArdxNy576pceUJLgrbNKwNpAp9z7aoNA== X-Received: by 2002:a05:6402:1d0e:b0:54d:2efd:369e with SMTP id dg14-20020a0564021d0e00b0054d2efd369emr1100547edb.1.1701790673178; Tue, 05 Dec 2023 07:37:53 -0800 (PST) Received: from pstanner-thinkpadt14sgen1.remote.csb ([2a01:599:912:71c8:c243:7b37:30b:a236]) by smtp.gmail.com with ESMTPSA id r15-20020a056402018f00b0054c21d1fda7sm1244578edv.1.2023.12.05.07.37.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Dec 2023 07:37:52 -0800 (PST) From: Philipp Stanner To: Bjorn Helgaas , Arnd Bergmann , Johannes Berg , Randy Dunlap , NeilBrown , John Sanpe , Kent Overstreet , Niklas Schnelle , Philipp Stanner , Dave Jiang , Uladzislau Koshchanka , "Masami Hiramatsu (Google)" , David Gow , Kees Cook , Rae Moar , Geert Uytterhoeven , "wuqiang.matt" , Yury Norov , Jason Baron , Thomas Gleixner , Marco Elver , Andrew Morton , Ben Dooks , dakr@redhat.com Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, stable@vger.kernel.org, Arnd Bergmann Subject: [PATCH v4 1/5] lib/pci_iomap.c: fix cleanup bugs in pci_iounmap() Date: Tue, 5 Dec 2023 16:36:26 +0100 Message-ID: <20231205153629.26020-3-pstanner@redhat.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231205153629.26020-2-pstanner@redhat.com> References: <20231205153629.26020-2-pstanner@redhat.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 pci_iounmap() in lib/pci_iomap.c is supposed to check whether an address is within ioport-range IF the config specifies that ioports exist. If so, the port should be unmapped with ioport_unmap(). If not, it's a generic MMIO address that has to be passed to iounmap(). The bugs are: 1. ioport_unmap() is missing entirely, so this function will never actually unmap a port. 2. the #ifdef for the ioport-ranges accidentally also guards iounmap(), potentially compiling an empty function. This would cause the mapping to be leaked. Implement the missing call to ioport_unmap(). Move the guard so that iounmap() will always be part of the function. CC: # v5.15+ Fixes: 316e8d79a095 ("pci_iounmap'2: Electric Boogaloo: try to make sense of it all") Reported-by: Danilo Krummrich Suggested-by: Arnd Bergmann Signed-off-by: Philipp Stanner Reviewed-by: Arnd Bergmann --- lib/pci_iomap.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c index ce39ce9f3526..6e144b017c48 100644 --- a/lib/pci_iomap.c +++ b/lib/pci_iomap.c @@ -168,10 +168,12 @@ void pci_iounmap(struct pci_dev *dev, void __iomem *p) uintptr_t start = (uintptr_t) PCI_IOBASE; uintptr_t addr = (uintptr_t) p; - if (addr >= start && addr < start + IO_SPACE_LIMIT) + if (addr >= start && addr < start + IO_SPACE_LIMIT) { + ioport_unmap(p); return; - iounmap(p); + } #endif + iounmap(p); } EXPORT_SYMBOL(pci_iounmap);