From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 2053E12C47C for ; Fri, 24 May 2024 15:10:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716563446; cv=none; b=F0O207603KtZRoMjpur9YNOWAZtFi9rki54qMpN4b4tdCGUuTT6UIz+38h0udPcN00GxqSrFznv3AXoVvrWC/wGzrF9I1BNf6P2OvZtFw+Mi6BPpUpEHcVezhkCgiFrn9HunhoYFwyAVMZt8n6NhFgAsWz1ZIa9QEotWhDhFoFU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716563446; c=relaxed/simple; bh=/JPBnf/tT5x488gOq5spodVjK0UxGlMVpiCCS60yCEs=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=WXZOgvo1/ldJq1lrcqkJEjMdN5bZGMku2YE5FwhRO8esvvbkJPvp1oc55468Ngsr/gbj1Mspc8i+w9SIGw9XXDTUHBRjfWeb3zCl3VLOnUKmiFwUJCClEHdVtfBAaxY+ta2k9oWFsllYXP+Em79SmOozPAkiqA70Ofwvl1ZZWUU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=kr+AUf0b; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="kr+AUf0b" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 49B2FC2BBFC; Fri, 24 May 2024 15:10:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1716563445; bh=/JPBnf/tT5x488gOq5spodVjK0UxGlMVpiCCS60yCEs=; h=From:To:Cc:Subject:Date:Reply-to:From; b=kr+AUf0bRlWqU4kayp7gh8yLbpt3A6s6nfjQrlAuogReZC0A5YX4iPq3Uo+v36e4d o5ZhidWc2NGdFME08/BQcHqL9UDG4cTndVDuN9ASGB/iaRUla+vRQKSfEszCpA0L23 ngCgW4MZ2C4sANzWUaYaEA8bZn7HjaE7+prFQ2Rc= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2021-47533: drm/vc4: kms: Clear the HVS FIFO commit pointer once done Date: Fri, 24 May 2024 17:09:53 +0200 Message-ID: <2024052436-CVE-2021-47533-a03a@gregkh> X-Mailer: git-send-email 2.45.1 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=2229; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=/JPBnf/tT5x488gOq5spodVjK0UxGlMVpiCCS60yCEs=; b=owGbwMvMwCRo6H6F97bub03G02pJDGkBazd63TEPPCpf+FpN0iFpQaTm5eoGbec5Hpun3qi5c kav7vC1jlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZiIvg/DXGk128O3C+wv/Hq8 1N83hjVZXnxeKcN87+LmH9edtlYwFW5/yhJ0JKO4OlsHAA== X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit Description =========== In the Linux kernel, the following vulnerability has been resolved: drm/vc4: kms: Clear the HVS FIFO commit pointer once done Commit 9ec03d7f1ed3 ("drm/vc4: kms: Wait on previous FIFO users before a commit") introduced a wait on the previous commit done on a given HVS FIFO. However, we never cleared that pointer once done. Since drm_crtc_commit_put can free the drm_crtc_commit structure directly if we were the last user, this means that it can lead to a use-after free if we were to duplicate the state, and that stale pointer would even be copied to the new state. Set the pointer to NULL once we're done with the wait so that we don't carry over a pointer to a free'd structure. The Linux kernel CVE team has assigned CVE-2021-47533 to this issue. Affected and fixed versions =========================== Issue introduced in 5.12 with commit 9ec03d7f1ed3 and fixed in 5.15.7 with commit 2931db9a5ed2 Issue introduced in 5.12 with commit 9ec03d7f1ed3 and fixed in 5.16 with commit d134c5ff71c7 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2021-47533 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/gpu/drm/vc4/vc4_kms.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/2931db9a5ed219546cf2ae0546698faf78281b89 https://git.kernel.org/stable/c/d134c5ff71c7f2320fc7997f2fbbdedf0c76889a