linux-kernel - [PATCH 6.7 462/713] ASoC: SOF: Add some bounds checking to firmware data

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240324224720.1345309-463-sashal@kernel.org>
Date: Sun, 24 Mar 2024 18:43:08 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.7 462/713] ASoC: SOF: Add some bounds checking to firmware data

From: Dan Carpenter <dan.carpenter@...aro.org>

[ Upstream commit 98f681b0f84cfc3a1d83287b77697679e0398306 ]

Smatch complains about "head->full_size - head->header_size" can
underflow.  To some extent, we're always going to have to trust the
firmware a bit.  However, it's easy enough to add a check for negatives,
and let's add a upper bounds check as well.

Fixes: d2458baa799f ("ASoC: SOF: ipc3-loader: Implement firmware parsing and loading")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
Link: https://msgid.link/r/5593d147-058c-4de3-a6f5-540ecb96f6f8@moroto.mountain
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/sof/ipc3-loader.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/sof/ipc3-loader.c b/sound/soc/sof/ipc3-loader.c
index 28218766d2114..6e3ef06721106 100644
--- a/sound/soc/sof/ipc3-loader.c
+++ b/sound/soc/sof/ipc3-loader.c
@@ -148,6 +148,8 @@ static size_t sof_ipc3_fw_parse_ext_man(struct snd_sof_dev *sdev)
 
 	head = (struct sof_ext_man_header *)fw->data;
 	remaining = head->full_size - head->header_size;
+	if (remaining < 0 || remaining > sdev->basefw.fw->size)
+		return -EINVAL;
 	ext_man_size = ipc3_fw_ext_man_size(sdev, fw);
 
 	/* Assert firmware starts with extended manifest */
-- 
2.43.0