From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E49AB171CC for ; Wed, 9 Aug 2023 11:29:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E8B8C433C8; Wed, 9 Aug 2023 11:29:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691580569; bh=klIyRPhZk1qjMfAf/bEyH2s8w7OPj8rpn0B/fHo3njE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hI1hg78qmIB7XqccsBkpFfGKYvfvV4LneML1b9vMdiLe/dsBSifPUTyfRi07zIxel rE+RarE69v/XxvVNKkXI8SzAWS57lNrihE87yqR39jtBcem6nELQLMh7L9UFhXI3HY H+Z4uvsIQ0MIj9dNgLRko2T6ScxJ9s99aY82RULs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Zhang Shurong , Dan Carpenter Subject: [PATCH 5.4 071/154] staging: ks7010: potential buffer overflow in ks_wlan_set_encode_ext() Date: Wed, 9 Aug 2023 12:41:42 +0200 Message-ID: <20230809103639.339363814@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809103636.887175326@linuxfoundation.org> References: <20230809103636.887175326@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Zhang Shurong commit 5f1c7031e044cb2fba82836d55cc235e2ad619dc upstream. The "exc->key_len" is a u16 that comes from the user. If it's over IW_ENCODING_TOKEN_MAX (64) that could lead to memory corruption. Fixes: b121d84882b9 ("staging: ks7010: simplify calls to memcpy()") Cc: stable Signed-off-by: Zhang Shurong Reviewed-by: Dan Carpenter Link: https://lore.kernel.org/r/tencent_5153B668C0283CAA15AA518325346E026A09@qq.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/ks7010/ks_wlan_net.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/staging/ks7010/ks_wlan_net.c +++ b/drivers/staging/ks7010/ks_wlan_net.c @@ -1584,8 +1584,10 @@ static int ks_wlan_set_encode_ext(struct commit |= SME_WEP_FLAG; } if (enc->key_len) { - memcpy(&key->key_val[0], &enc->key[0], enc->key_len); - key->key_len = enc->key_len; + int key_len = clamp_val(enc->key_len, 0, IW_ENCODING_TOKEN_MAX); + + memcpy(&key->key_val[0], &enc->key[0], key_len); + key->key_len = key_len; commit |= (SME_WEP_VAL1 << index); } break;