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 9C6C253A7; Fri, 6 Dec 2024 15:17:49 +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=1733498269; cv=none; b=kxFAps1IFETjPon686T/+M17RXztlwk6zpysJCeYJncEO5uC85KiDtAxfW3hubgkHIznaqZnQBW4BJGNwKxgPxEHaDW2r/YQWdOkYafTF1X2edC377pATxarcy/p+TtbNVugjHjYGmCuhAdOLB+l1O9ZmgHleuvu4Ec8OwKT9zc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733498269; c=relaxed/simple; bh=jp8a4WXlYukhsYoKKyGs5Vrf7zmmQcknmXYSmOTN3Io=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=k3j3Jq+pC1K3w5mjNsnB7M59ePN1SD2nP6wiM+nsMQYglPgmCNkXzn/EKFaA0TlAmEBshlXNCOD0KQYvhPbUDsuTMpZEHiKOxYV9fc8ftNU9olHhg2tQo9LC2QmoniMT1MGeWEHvJaDm4Vo77i1p6TlPPg+Xdx52u4YyLwKOcy4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=uK0BjK1q; 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="uK0BjK1q" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B7D5AC4CEDC; Fri, 6 Dec 2024 15:17:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733498269; bh=jp8a4WXlYukhsYoKKyGs5Vrf7zmmQcknmXYSmOTN3Io=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uK0BjK1qB1P8xWvyQbWdzcayAHiPeTF1IagTHWUywu7NwLjo0M6yQuJ2C6yfDdb6M QnqXNayAGAmHPvAv7KqUvtcU7DJ01DCXBjAR7qQHA14rAMZrguPoRgcqPzMJghrNvy k/n3dCJM/9LEvKDc1WJwnKbZ4+3myehPYPZwAXtE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+4bf62a7b1d0f4fdb7ae2@syzkaller.appspotmail.com, Takashi Iwai Subject: [PATCH 6.6 535/676] ALSA: pcm: Add sanity NULL check for the default mmap fault handler Date: Fri, 6 Dec 2024 15:35:54 +0100 Message-ID: <20241206143714.257608504@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241206143653.344873888@linuxfoundation.org> References: <20241206143653.344873888@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai commit d2913a07d9037fe7aed4b7e680684163eaed6bc4 upstream. A driver might allow the mmap access before initializing its runtime->dma_area properly. Add a proper NULL check before passing to virt_to_page() for avoiding a panic. Reported-by: syzbot+4bf62a7b1d0f4fdb7ae2@syzkaller.appspotmail.com Cc: Link: https://patch.msgid.link/20241120141104.7060-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/core/pcm_native.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -3794,9 +3794,11 @@ static vm_fault_t snd_pcm_mmap_data_faul return VM_FAULT_SIGBUS; if (substream->ops->page) page = substream->ops->page(substream, offset); - else if (!snd_pcm_get_dma_buf(substream)) + else if (!snd_pcm_get_dma_buf(substream)) { + if (WARN_ON_ONCE(!runtime->dma_area)) + return VM_FAULT_SIGBUS; page = virt_to_page(runtime->dma_area + offset); - else + } else page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset); if (!page) return VM_FAULT_SIGBUS;