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 2B211345EDB; Wed, 7 Oct 2026 02:05:09 +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=1791338710; cv=none; b=s04V2Bh9+tzLCnAjHZdqZe7Onh7D75cJOUXI3lKA2vaRU7yZwHESu2xyNfVDDYoPUmpPML92Jbc4VBYtHPuEpvMgLCUjPv09SQyeZkKtvecZ/Gqix6tMsEHEAr/oMZQet2c4me2ktZ04G0q/DtEyD2KFoNaBFfWKmaiHd8Fipfg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791338710; c=relaxed/simple; bh=1Z/0uUNvVDWUrUtVqZUV+8ilxp2LjPAqnoLyxqWjRt8=; h=Date:To:From:Subject:Message-Id; b=CVl44iRSCbqvegBpuyzSTeRmT46RpI+kTkrFiM0q3nT/epV94LlnD2DEUwVN6WJ1T5AKzV6F5HgHjfNUOOUatSis2PUUGcrt7FzM+IzCcWAH5f9C1tpF90rso+9w5bgdEH+U+bfTGu0D88ld7a+w4BvXx7Vdyq66ydPoyPKsAxo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=krouSewm; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="krouSewm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F2E4E1F0089C; Wed, 7 Oct 2026 02:05:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791338709; bh=ALJt2HPffSH5ykRhBIV48aF6Lyj1CB3QuWAGsX4Qv3s=; h=Date:To:From:Subject; b=krouSewmWWDoaqppplk1QmnGuiIsgFKCHq1YJkrMpJcrzqRbawDTALxc9iXhXLY4Q /yqFhk8Un1YBe6K/XsWxynLUf5EUzcaiNfXUJCJDn6prYWaInHnAs07YUrZVqJE7QY O+d86kv3vsPbwoiN1oZ6wAU5oCZ88S5Fxxx0PIr0= Date: Tue, 06 Oct 2026 19:05:08 -0700 To: mm-commits@vger.kernel.org,stable@vger.kernel.org,mporter@kernel.crashing.org,gregkh@linuxfoundation.org,dan.carpenter@linaro.org,alex.bou9@gmail.com,james010kim@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-nonmm-stable] rapidio-mport_cdev-fix-use-after-free-in-mport_mm_close.patch removed from -mm tree Message-Id: <20261007020508.F2E4E1F0089C@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: rapidio: mport_cdev: fix use-after-free in mport_mm_close() has been removed from the -mm tree. Its filename was rapidio-mport_cdev-fix-use-after-free-in-mport_mm_close.patch This patch was dropped because it was merged into the mm-nonmm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: James Kim Subject: rapidio: mport_cdev: fix use-after-free in mport_mm_close() Date: Mon, 14 Sep 2026 13:23:27 +0900 A use-after-free vulnerability was identified in mport_mm_close() in drivers/rapidio/devices/rio_mport_cdev.c, identical to the pattern previously addressed in dma_req_free(). This is observable from userspace when an application creates an mmap mapping via the RapidIO character device and subsequently unmaps it (or terminates, triggering exit_mmap()). During munmap, mport_mm_close() is invoked and drops the mapping reference via kref_put(). If kref_put() drops the last reference, mport_release_mapping() is called, which frees the underlying rio_mport_mapping structure. The subsequent mutex_unlock() then dereferences map->md to unlock buf_mutex, leading to a use-after-free: mport_mm_close() -> mutex_lock(&map->md->buf_mutex); ... -> kref_put(&map->ref, mport_release_mapping); /* map is freed */ -> mutex_unlock(&map->md->buf_mutex); /* UAF: map used */ Fix this by caching map->md before kref_put() and using the cached pointer for mutex unlocking, ensuring that freed memory is not accessed. Link: https://lore.kernel.org/20260914042327.49798-1-james010kim@gmail.com Fixes: e8de370188d0 ("rapidio: add mport char device driver") Signed-off-by: James Kim Signed-off-by: Andrew Morton Cc: Alexandre Bounine Cc: Dan Carpenter Cc: Greg Kroah-Hartman Cc: Matt Porter Cc: --- drivers/rapidio/devices/rio_mport_cdev.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/rapidio/devices/rio_mport_cdev.c~rapidio-mport_cdev-fix-use-after-free-in-mport_mm_close +++ a/drivers/rapidio/devices/rio_mport_cdev.c @@ -2167,11 +2167,12 @@ static void mport_mm_open(struct vm_area static void mport_mm_close(struct vm_area_struct *vma) { struct rio_mport_mapping *map = vma->vm_private_data; + struct mport_dev *md = map->md; rmcd_debug(MMAP, "%pad", &map->phys_addr); - mutex_lock(&map->md->buf_mutex); + mutex_lock(&md->buf_mutex); kref_put(&map->ref, mport_release_mapping); - mutex_unlock(&map->md->buf_mutex); + mutex_unlock(&md->buf_mutex); } static const struct vm_operations_struct vm_ops = { _ Patches currently in -mm which might be from james010kim@gmail.com are