linux-kernel - [PATCH v4 8/8] staging: r8188eu: check firmware header existence before access

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Date:   Sun, 17 Apr 2022 19:54:41 +0200
From:   Michael Straube <straube.linux@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     Larry.Finger@...inger.net, phil@...lpotter.co.uk,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Michael Straube <straube.linux@...il.com>
Subject: [PATCH v4 8/8] staging: r8188eu: check firmware header existence before access

We should access the fields of fwhdr only if the check for firmware
header existence is true. Move the affected code into the if block
that checks firmware header existence.

Signed-off-by: Michael Straube <straube.linux@...il.com>
---
v4:
- no changes

v3:
- no real changes,
  just the pr_info() -> pr_info_once() from patch 7/8 is different

v2:
- no changes

 drivers/staging/r8188eu/core/rtw_fw.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_fw.c b/drivers/staging/r8188eu/core/rtw_fw.c
index 7c0653bb3bbc..bf077876ed3d 100644
--- a/drivers/staging/r8188eu/core/rtw_fw.c
+++ b/drivers/staging/r8188eu/core/rtw_fw.c
@@ -256,14 +256,13 @@ int rtl8188e_firmware_download(struct adapter *padapter)
 	fw_data = dvobj->firmware.data;
 	fw_size = dvobj->firmware.size;
 
-	/*  To Check Fw header. Added by tynli. 2009.12.04. */
 	fwhdr = (struct rt_firmware_hdr *)dvobj->firmware.data;
 
-	pr_info_once("%sFirmware Version %d, SubVersion %d, Signature 0x%x\n",
-		     DRIVER_PREFIX, le16_to_cpu(fwhdr->version), fwhdr->subversion,
-		     le16_to_cpu(fwhdr->signature));
-
 	if (IS_FW_HEADER_EXIST(fwhdr)) {
+		pr_info_once("%sFirmware Version %d, SubVersion %d, Signature 0x%x\n",
+			     DRIVER_PREFIX, le16_to_cpu(fwhdr->version), fwhdr->subversion,
+			     le16_to_cpu(fwhdr->signature));
+
 		fw_data = fw_data + sizeof(struct rt_firmware_hdr);
 		fw_size = fw_size - sizeof(struct rt_firmware_hdr);
 	}
-- 
2.35.1