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Mon, 2 Nov 2026 14:23:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793629433; bh=5idTO632MfTOh8DHBwsM5N+e4TPz7tW3oLCXLVOM1bU=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=bTZqC8ZGdXxcFQd/3hUg3IW0rejRlM5K7QNfkjVY794R3YHFyVPBjLRGBUayKfnuB o4SatPA8T6TNXjcltzn1X/uXTJRuPb2Rlfe8Ay7Lihwlip36LKfkuZzZ2uLD6o1lsn vWG9sGTbL522XI7qvpHjUHz0MjvfEW17lvoFh1SmnCSdWAreu8wFgjZqF1c34Gdkms 8WxYyheLECrp0gW7AmhDwmWf847MgsFNk7fCgXMkAYJi+8MwP0s9Ehv9+slB77KTjN Sw08w8UDfVr3lkJvosLxlggPqTYkDbchMzBmGfJx4chWnQ4NiIdZtKUt6Nf2GmPnXa Jl4P8fqea13Rw== From: Christian Brauner Date: Mon, 02 Nov 2026 15:21:24 +0100 Subject: [PATCH RFC 09/38] ALSA: info: don't write past the end of a data entry X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , Precedence: list X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-work-procfs-bugfixes-v1-9-59422ed3e465@kernel.org> References: <20261102-work-procfs-bugfixes-v1-0-59422ed3e465@kernel.org> In-Reply-To: <20261102-work-procfs-bugfixes-v1-0-59422ed3e465@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever , stable@vger.kernel.org X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1286; i=brauner@kernel.org; h=from:subject:message-id; bh=QDMkZvLaF3IWyPhoUUb9QYkcrNtI4YpDxPIetQD5jl0=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9mJOVdu4T53QO71keyQs+h0u8P+U2ReHO2uq+t72Xn 8zfu3i/eUcpC4MYF4OsmCKLQ7tJuNxynorNRpkaMHNYmUCGMHBxCsBE2h8x/M+p1jq63Xz2BXau 4IAvwU63lx9v/bDSeMfWNnHlszsNnwsyMhyxXa9lwZT9csfJKq+qsC5mVf35X28Ym77fVPdQjT/ rICMA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 snd_info_entry_write() clamps the count to what is left of the entry by computing entry->size - pos as a size_t. For a position past the end that wraps and the write goes to the driver unclamped, for opl4 into sample memory outside of what the entry covers. At the end of the entry the driver gets a count of 0 and vmalloc(0) warns. Before the clamp moved into the common code the driver ignored such writes. Fail them with -ENOSPC instead, like a block device does at the end of the device. Returning 0 would make writers that use stdio retry forever. Fixes: d97e1b78239c ("ALSA: info - Check file position validity in common layer") Cc: stable@vger.kernel.org Signed-off-by: Christian Brauner (Amutable) --- sound/core/info.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/core/info.c b/sound/core/info.c index c4d57d0809ad..982087bc8575 100644 --- a/sound/core/info.c +++ b/sound/core/info.c @@ -171,6 +171,8 @@ static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer pos = *offset; if (!valid_pos(pos, count)) return -EIO; + if (pos >= entry->size) + return count ? -ENOSPC : 0; if (count > 0) { size_t maxsize = entry->size - pos; count = min(count, maxsize); -- 2.53.0