From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lj1-f177.google.com (mail-lj1-f177.google.com [209.85.208.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5886A7C for ; Sun, 24 Apr 2022 19:01:33 +0000 (UTC) Received: by mail-lj1-f177.google.com with SMTP id v4so3277685ljd.10 for ; Sun, 24 Apr 2022 12:01:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=+tusk1aAliVBnk698Wzreusezn6ixz2Ndj0yD2FT6oc=; b=IJ3yiYTbx1PS6R8J/dzPgtTLTnGNzwwOcXou8Z3ksezDlwUWJs6VmBY+p1ftGw7tSl mjZ9rwHSjgcfX5WknNLLAq1VLL8pB5N+rSDR5sXPk6a/ZbekHE3gxKK3gLkVMzFXnD28 Ewz2+k9IMYx/Evk2TXQ6evAdofCjh1Ha/V3juheITvbC7/KcJ8mxQ3fBFGBbks+ko0zH j8D5MXMN1/M7z0yZO5B7Rba/qvyyhtmw+CgcL28eTchETC03Fj+7sP2a1pYzK4Ojg8oW 0vMe0S3KxO8oj5nbZ/FPdDnx4cJSaFPmNca27EAZ8Swd3UMA4OmEA5hbI8pk9OiabUHK TKdw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=+tusk1aAliVBnk698Wzreusezn6ixz2Ndj0yD2FT6oc=; b=McHWlDH9qJkSKgBUb8lPQN/ioqavGGqqt7TqUFvrNgaYpT/5X5FUVf9bvRtiM5zn2/ tLxFzSgHprNqydwlg6vnPTBI1frXc19fe2WCHp5q/MhJzzyyNQgIY0N88w+Lp6gvjYO2 UDnsEjeUSpAb2P8GGt2lomB92Q0Z9W+v/eaaBwF8bfExWZF0XIxRbIWQC5F37t8LzXdm gFg1aGYYhGjKyHIzdbkTc1Jms8ZRZQi+iYcmWBa8XzgtDNLuHY2/6gfTm4RThfNWPafv jq4KyCDyUk8xh26c9StzZwKCksfNtj+y2S/1kGDDnVMnLz+xgDUeBsXEvoorG09FN5og S7ng== X-Gm-Message-State: AOAM5309jkR3MA30Yd/l2YPq4sm+u1V/vPUYRm/Vm+0ktdWIVdwlt+aj z2jXHix6c2q9S2FwJsx/Ev0= X-Google-Smtp-Source: ABdhPJy6nfIi6y1OenfKsFPHIu8uWbc7mMPb+DsfPiY5lIpUSHJ15Zj0P3YBXEC0akZH5wGrwWh0yg== X-Received: by 2002:a2e:9e19:0:b0:247:deb7:cd9f with SMTP id e25-20020a2e9e19000000b00247deb7cd9fmr8622396ljk.261.1650826891258; Sun, 24 Apr 2022 12:01:31 -0700 (PDT) Received: from [192.168.1.11] ([94.103.225.17]) by smtp.gmail.com with ESMTPSA id x16-20020a19e010000000b0046bb663f05csm1113153lfg.99.2022.04.24.12.01.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 24 Apr 2022 12:01:30 -0700 (PDT) Message-ID: <88d617e4-419c-0d57-b0e2-f743d208c766@gmail.com> Date: Sun, 24 Apr 2022 22:01:29 +0300 Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH 1/3] staging: r8188eu: fix null check in rtw_free_recvframe Content-Language: en-US To: Vihas Makwana , Larry Finger , Phillip Potter , Greg Kroah-Hartman , Michael Straube Cc: linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Dan Carpenter References: <20220424163132.37007-1-makvihas@gmail.com> <20220424163132.37007-2-makvihas@gmail.com> From: Pavel Skripkin In-Reply-To: <20220424163132.37007-2-makvihas@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Vihas, On 4/24/22 19:31, Vihas Makwana wrote: > There's a NULL check on padapter in rtw_recv.c:170 which makes no sense as > rtw_recv.c:152 dereferences it unconditionally and it would have already > crashed at this point. > Fix this by moving the dereference line inside the check. > > Signed-off-by: Vihas Makwana > --- > drivers/staging/r8188eu/core/rtw_recv.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/staging/r8188eu/core/rtw_recv.c b/drivers/staging/r8188eu/core/rtw_recv.c > index c1005ddaa..4cf9b4b8f 100644 > --- a/drivers/staging/r8188eu/core/rtw_recv.c > +++ b/drivers/staging/r8188eu/core/rtw_recv.c > @@ -154,7 +154,6 @@ int rtw_free_recvframe(struct recv_frame *precvframe, struct __queue *pfree_recv > if (!precvframe) > return _FAIL; > padapter = precvframe->adapter; > - precvpriv = &padapter->recvpriv; This expression just an addr calculation, so it does not lead to panic in case of padapter being NULL > if (precvframe->pkt) { > dev_kfree_skb_any(precvframe->pkt);/* free skb by driver */ > precvframe->pkt = NULL; > @@ -169,6 +168,7 @@ int rtw_free_recvframe(struct recv_frame *precvframe, struct __queue *pfree_recv > list_add_tail(&precvframe->list, get_list_head(pfree_recv_queue)); > > if (padapter) { > + precvpriv = &padapter->recvpriv; > if (pfree_recv_queue == &precvpriv->free_recv_queue) > precvpriv->free_recvframe_cnt++; > } With regards, Pavel Skripkin