[PATCH 6.1 293/451] ASoC: SOF: Add some bounds checking to firmware data

Sasha Levin
2024-03-24T23:16:53Z

From: Dan Carpenter <dan.carpenter@linaro.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@linaro.org>
Link: https://msgid.link/r/5593d147-058c-4de3-a6f5-540ecb96f6f8@moroto.mountain
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.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