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Thu, 05 Feb 2026 23:54:59 -0800 (PST) From: lukagejak5@gmail.com X-Google-Original-From: luka.gejak@linux.dev To: Greg Kroah-Hartman Cc: Dan Carpenter , linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Luka Gejak , stable@vger.kernel.org Subject: [PATCH v2 01/26] staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm_ie Date: Fri, 6 Feb 2026 08:54:14 +0100 Message-ID: <20260206075439.103287-2-luka.gejak@linux.dev> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260206075439.103287-1-luka.gejak@linux.dev> References: <20260206075439.103287-1-luka.gejak@linux.dev> Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Luka Gejak 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@vger.kernel.org Signed-off-by: Luka Gejak --- 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 8e1e1c97f0c4..0b82b1f2f1ec 100644 --- a/drivers/staging/rtl8723bs/core/rtw_mlme.c +++ b/drivers/staging/rtl8723bs/core/rtw_mlme.c @@ -2000,7 +2000,10 @@ 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