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Wed, 15 Apr 2026 09:10:50 -0700 (PDT) Date: Wed, 15 Apr 2026 19:10:47 +0300 From: Dan Carpenter To: Delene Tchio Romuald Cc: gregkh@linuxfoundation.org, Ethan Tidmore , Sam Daly , linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 1/5] staging: rtl8723bs: fix heap buffer overflow in recvframe_defrag() Message-ID: References: <20260405101548.124829-1-delenetchior1@gmail.com> <20260405101548.124829-2-delenetchior1@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Apr 15, 2026 at 06:24:10PM +0300, Dan Carpenter wrote: > > diff --git a/drivers/staging/rtl8723bs/core/rtw_recv.c b/drivers/staging/rtl8723bs/core/rtw_recv.c > > index f78194d508dfc..717e0594d983a 100644 > > --- a/drivers/staging/rtl8723bs/core/rtw_recv.c > > +++ b/drivers/staging/rtl8723bs/core/rtw_recv.c > > @@ -1132,7 +1132,13 @@ static union recv_frame *recvframe_defrag(struct adapter *adapter, > > /* append to first fragment frame's tail (if privacy frame, pull the ICV) */ > > recvframe_pull_tail(prframe, pfhdr->attrib.icv_len); > > There is no error checking on these pull calls. They're supposed > to return NULL if pfhdr->attrib.icv_len is too big. (There is a similar > caller earlier on the line before). > Actually if these fail > > > > - /* memcpy */ > > + /* Verify the receiving buffer has enough space for the fragment */ > > + if (pnfhdr->len > (uint)(pfhdr->rx_end - pfhdr->rx_tail)) { > then the pfhdr->rx_end and pfhdr->rx_tail pointers are wrong. So you really do need to add the error checking before you do the resend. regards, dan carpenter