linux-kernel - [PATCH v3 01/22] staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm

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Message-ID: <20260208110111.46642-2-luka.gejak@linux.dev>
Date: Sun,  8 Feb 2026 12:00:50 +0100
From: luka.gejak@...ux.dev
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Dan Carpenter <dan.carpenter@...aro.org>,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Luka Gejak <luka.gejak@...ux.dev>,
	stable@...r.kernel.org
Subject: [PATCH v3 01/22] staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm_ie

From: Luka Gejak <luka.gejak@...ux.dev>

The current code checks 'i + 5 < in_len' at the end of the if statement.
However, it accesses 'in_ie[i + 5]' before that check, which can lead
to an out-of-bounds read. Move the length check to the beginning of the
conditional to ensure the index is within bounds before accessing the
array.

Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver")
Cc: stable@...r.kernel.org
Signed-off-by: Luka Gejak <luka.gejak@...ux.dev>
---
 drivers/staging/rtl8723bs/core/rtw_mlme.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme.c b/drivers/staging/rtl8723bs/core/rtw_mlme.c
index 22dc36e8e38a..2bd6f5367bdc 100644
--- a/drivers/staging/rtl8723bs/core/rtw_mlme.c
+++ b/drivers/staging/rtl8723bs/core/rtw_mlme.c
@@ -1988,7 +1988,10 @@ int rtw_restruct_wmm_ie(struct adapter *adapter, u8 *in_ie, u8 *out_ie, uint in_
 	while (i < in_len) {
 		ielength = initial_out_len;
 
-		if (in_ie[i] == 0xDD && in_ie[i + 2] == 0x00 && in_ie[i + 3] == 0x50  && in_ie[i + 4] == 0xF2 && in_ie[i + 5] == 0x02 && i + 5 < in_len) { /* WMM element ID and OUI */
+		if (i + 5 < in_len &&
+		    in_ie[i] == 0xDD && in_ie[i + 2] == 0x00 &&
+		    in_ie[i + 3] == 0x50 && in_ie[i + 4] == 0xF2 &&
+		    in_ie[i + 5] == 0x02) {
 			for (j = i; j < i + 9; j++) {
 				out_ie[ielength] = in_ie[j];
 				ielength++;
-- 
2.52.0