From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-lj1-f180.google.com (mail-lj1-f180.google.com [209.85.208.180]) (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 1D6C97C for ; Sun, 24 Apr 2022 18:53:12 +0000 (UTC) Received: by mail-lj1-f180.google.com with SMTP id l19so2804516ljb.7 for ; Sun, 24 Apr 2022 11:53:11 -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=FC/8yLdSqiq2IyvCXByJ/UPgQYfMYiDtun4dRAazNxU=; b=Q78roLaBQBx0gfXmK715idh3BO84YfUpV+y9xmJ5vf/qCZ6phRouk4OLl1ZVPxD/lc i2eh2l3J5ZYsGpGFPJVPmWsurzpr540+spGY2f6ikvXipHnjkeMVTyD81Jd7Kg6T4KP7 g0W+nUb1rbm6HX1h/tlcI8aVwRf4lsMJzX8w5SA0B1w1nxf9pFK4AGSfHDGY0G5r4eqG Noe8KRdZUjEXnEGIRwNFzjsVw+VwfHQwwirwkilemBQ716SMj6UFDeaxVB7NxbkbbHH1 2PekuhxRCBhDnAT84Z+97/q2YPpdHBn29KvVUBOUDQCLX6O/6LUs6537AvBtkuWJ6NuW ZSqA== 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=FC/8yLdSqiq2IyvCXByJ/UPgQYfMYiDtun4dRAazNxU=; b=FJ/Gi+aBZJgAzt08g0kEem8qQGS/NBdVN1GsiPB+Z9qmtShxCY88+TwmjiG5HIxP+x QfKLFYDUvLdrBbUOV8P11HNXUNize+xkSgQFqOGDFPWFnk/goLd+dSx18DHIAlXOAxvi tckZ6gYWSQRI9iL7xwgex1E7CJxeECGR0IytmylMBkfysYgwCTzXJUHcAKmn0Plk8Jc2 yvZwPt/o4FF1dEzD+uvydYG5VLmTv6V+X6K/FlfGrX2R9uMoBWL+ITdU+HKxiRSEJ003 QdXk8s68fmm2Gl0/ccTY2aCKf2qze9oojOZzvci4k64kipDrKrb+PjjbOJILuPmSGA+Y YQBg== X-Gm-Message-State: AOAM532HlGTKMveEhpRGbt+0izy2jpDaf28Zk3XJeHu0PpMDZpues3SQ /lClbGKtCz0u//rEaf46J/s= X-Google-Smtp-Source: ABdhPJybHN9XnQZfI3riHPEAJN67QQsQUACTyDDu6Fl0+w3A3H5LdF/DAlyKBRYxsi8w/Wmc31Ubfg== X-Received: by 2002:a05:651c:17a3:b0:245:f39e:f2d2 with SMTP id bn35-20020a05651c17a300b00245f39ef2d2mr9346694ljb.490.1650826390054; Sun, 24 Apr 2022 11:53:10 -0700 (PDT) Received: from [192.168.1.11] ([94.103.225.17]) by smtp.gmail.com with ESMTPSA id l26-20020a2e701a000000b0024f0d5fb1b0sm340283ljc.94.2022.04.24.11.53.08 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 24 Apr 2022 11:53:09 -0700 (PDT) Message-ID: <85f946c9-235e-cc69-4d19-1ebf972cd935@gmail.com> Date: Sun, 24 Apr 2022 21:53:07 +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 2/3] staging: r8188eu: fix null check in _rtw_enqueue_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> <20220424163132.37007-3-makvihas@gmail.com> From: Pavel Skripkin In-Reply-To: <20220424163132.37007-3-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:189 which makes no sense as > rtw_recv.c:184 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 | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/staging/r8188eu/core/rtw_recv.c b/drivers/staging/r8188eu/core/rtw_recv.c > index 4cf9b4b8f..7d306a3c6 100644 > --- a/drivers/staging/r8188eu/core/rtw_recv.c > +++ b/drivers/staging/r8188eu/core/rtw_recv.c > @@ -181,12 +181,13 @@ int rtw_free_recvframe(struct recv_frame *precvframe, struct __queue *pfree_recv > int _rtw_enqueue_recvframe(struct recv_frame *precvframe, struct __queue *queue) > { > struct adapter *padapter = precvframe->adapter; > - struct recv_priv *precvpriv = &padapter->recvpriv; > + struct recv_priv *precvpriv; Actually, `&padapter->recvpriv` is not a de-reference, it's just address calculation, so in case of padapder being NULL precvpriv will contain offsetof(struct adapter, recvpriv). > > list_del_init(&precvframe->list); > list_add_tail(&precvframe->list, get_list_head(queue)); > > if (padapter) { > + precvpriv = &padapter->recvpriv; > if (queue == &precvpriv->free_recv_queue) > precvpriv->free_recvframe_cnt++; > } With regards, Pavel Skripkin