linux-kernel - [PATCH iio-next] iio: proximity: Fix use-after-free in hx9023s_send

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Message-Id: <20250107123510.44978-1-dheeraj.linuxdev@gmail.com>
Date: Tue,  7 Jan 2025 18:05:10 +0530
From: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
To: jic23@...nel.org,
	lars@...afoo.de
Cc: jstephan@...libre.com,
	yasin.lee.x@...il.com,
	dan.carpenter@...aro.org,
	nuno.sa@...log.com,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
Subject: [PATCH iio-next] iio: proximity: Fix use-after-free in hx9023s_send_cfg()

Reorder the assignment of fw_size to happen before release_firmware()
to avoid accessing the firmware structure after it's been freed.

Fixes: e9ed97be4fcc ("iio: proximity: hx9023s: Added firmware file parsing functionality")
Closes: https://scan7.scan.coverity.com/#/project-view/52337/11354?selectedIssue=1602791
Signed-off-by: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
---
 drivers/iio/proximity/hx9023s.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/proximity/hx9023s.c b/drivers/iio/proximity/hx9023s.c
index e092a935dbac..5aa8e5a22f32 100644
--- a/drivers/iio/proximity/hx9023s.c
+++ b/drivers/iio/proximity/hx9023s.c
@@ -1036,12 +1036,13 @@ static int hx9023s_send_cfg(const struct firmware *fw, struct hx9023s_data *data
 		return -ENOMEM;
 
 	memcpy(bin->data, fw->data, fw->size);
-	release_firmware(fw);
 
 	bin->fw_size = fw->size;
 	bin->fw_ver = bin->data[FW_VER_OFFSET];
 	bin->reg_count = get_unaligned_le16(bin->data + FW_REG_CNT_OFFSET);
 
+	release_firmware(fw);
+
 	return hx9023s_bin_load(data, bin);
 }
 
-- 
2.34.1