From nobody Mon Feb 9 13:39:08 2026 Received: from cvsmtppost38.nm.naver.com (cvsmtppost38.nm.naver.com [114.111.35.201]) (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 CE3CF29898B for ; Tue, 20 Jan 2026 13:32:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.111.35.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768915978; cv=none; b=q4u0QIPYyxqBuGqhwcIQZgvsKixNf57whWl4gW+WMLSr91O5swz7DLLYic8AN3DBKErBqopvhoS8w0GK2tEQ5mG9n5Mw72W79i1VKf2goXgcdgz8q2M5/gwrvQz84zKG7py0uW3+km65B1fDbRG/XPXobUoky5MncodZ5sO5Iww= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768915978; c=relaxed/simple; bh=X/ydUHbpKBCkVvcTSvF9OTD149Wif4LzunZVWqnYtGI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=TZpmVOBHDUgLPouUZ5+mCDGYIx9pMrfSiyqTzmRY/3k8OxM1WnV1tboTO32DKW1134LsxNLnenCySYfhQdEknXIibCxuejGfKuldKobSWdpncjFV2L6YunFp9AoobNHA424Bbh2W8D5IFjMp5LVDqsKyqbmbe9xQtkLZzEFsRto= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=naver.com; spf=pass smtp.mailfrom=naver.com; dkim=pass (2048-bit key) header.d=naver.com header.i=@naver.com header.b=gPif7Tb6; arc=none smtp.client-ip=114.111.35.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=naver.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=naver.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=naver.com header.i=@naver.com header.b="gPif7Tb6" Received: from cvsendbo023.nm ([10.112.22.35]) by cvsmtppost38.nm.naver.com with ESMTP id w6spyunbS3WazmDErfLgmg for ; Tue, 20 Jan 2026 13:22:47 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=naver.com; s=s20171208; t=1768915367; bh=X/ydUHbpKBCkVvcTSvF9OTD149Wif4LzunZVWqnYtGI=; h=From:To:Subject:Date:Message-ID:From:Subject:Feedback-ID: X-Works-Security; b=gPif7Tb6S2ARUAQPPMl5KlrgNnfklDBjTTX9W87sMGnOtGohCfzMEFKzrPRGr8bUs /oHukhxoS3N3WzlnExADsjTtdQ3dytpwT0smjo90hhMb+VbthCMf5HMaQTHwGdMv8r DOOSIJ5gnHyITAIw80brsbdSgzcVA9p+7qO6vqBGleGWy+thTEHJXgVahRgP6fHE3p fmts0tVMgJuO/HBofMAgpYb6g9dH+E4J8u15RMHeBtW52DvDFZT868eCRqx95mbC89 EXpTSnUrjhUAzrLWyJPn+QPOyx9Qg0L41zky8K+2OF9vpYfNKzUH+LkDXATCjBOdbC q++ZFaWAH7zBg== X-Session-ID: RAxcxranTBCuEILmzeu-IQ X-Works-Send-Opt: p/Y/jAJYjHmwKo2qKqJYFquqFNwkx0eFjAJYKg== X-Works-Smtp-Source: zdY/aA2rFqJZ+HmrFovZ+6E= Received: from JMW-Ubuntu.. ([14.38.141.199]) by cvnsmtp002.nm.naver.com with ESMTP id RAxcxranTBCuEILmzeu-IQ for (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Tue, 20 Jan 2026 13:22:46 -0000 From: Minu Jin To: gregkh@linuxfoundation.org Cc: andriy.shevchenko@linux.intel.com, abrahamadekunle50@gmail.com, dan.carpenter@linaro.org, milospuric856@gmail.com, zxcv2569763104@gmail.com, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Minu Jin Subject: [PATCH v2] staging: rtl8723bs: fix unchecked return value of skb_copy_bits Date: Tue, 20 Jan 2026 22:22:41 +0900 Message-ID: <20260120132241.2119454-1-s9430939@naver.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The function _rtw_pktfile_read() incorrectly updated the file pointer even when skb_copy_bits() failed. This patch fixes the issue by: 1. Propagating the negative error code from skb_copy_bits() if it fails, preventing internal pointer updates. 2. Updating all callers to check the return value and handle errors appropriately. Signed-off-by: Minu Jin --- drivers/staging/rtl8723bs/core/rtw_xmit.c | 25 +++++++++++++++---- .../staging/rtl8723bs/include/xmit_osdep.h | 2 +- drivers/staging/rtl8723bs/os_dep/xmit_linux.c | 12 ++++++--- 3 files changed, 29 insertions(+), 10 deletions(-) diff --git a/drivers/staging/rtl8723bs/core/rtw_xmit.c b/drivers/staging/rt= l8723bs/core/rtw_xmit.c index 21690857fd62..135bc5432be6 100644 --- a/drivers/staging/rtl8723bs/core/rtw_xmit.c +++ b/drivers/staging/rtl8723bs/core/rtw_xmit.c @@ -603,11 +603,13 @@ static void set_qos(struct pkt_file *ppktfile, struct= pkt_attrib *pattrib) s32 UserPriority =3D 0; =20 _rtw_open_pktfile(ppktfile->pkt, ppktfile); - _rtw_pktfile_read(ppktfile, (unsigned char *)ðerhdr, ETH_HLEN); + if (_rtw_pktfile_read(ppktfile, (unsigned char *)ðerhdr, ETH_HLEN) < 0) + return; =20 /* get UserPriority from IP hdr */ if (pattrib->ether_type =3D=3D 0x0800) { - _rtw_pktfile_read(ppktfile, (u8 *)&ip_hdr, sizeof(ip_hdr)); + if (_rtw_pktfile_read(ppktfile, (u8 *)&ip_hdr, sizeof(ip_hdr)) < 0) + return; UserPriority =3D ip_hdr.tos >> 5; } pattrib->priority =3D UserPriority; @@ -627,8 +629,12 @@ static s32 update_attrib(struct adapter *padapter, str= uct sk_buff *pkt, struct p struct qos_priv *pqospriv =3D &pmlmepriv->qospriv; signed int res =3D _SUCCESS; =20 + signed int ret; + _rtw_open_pktfile(pkt, &pktfile); - _rtw_pktfile_read(&pktfile, (u8 *)ðerhdr, ETH_HLEN); + ret =3D _rtw_pktfile_read(&pktfile, (u8 *)ðerhdr, ETH_HLEN); + if (ret < 0) + return ret; =20 pattrib->ether_type =3D ntohs(etherhdr.h_proto); =20 @@ -655,7 +661,9 @@ static s32 update_attrib(struct adapter *padapter, stru= ct sk_buff *pkt, struct p =20 u8 tmp[24]; =20 - _rtw_pktfile_read(&pktfile, &tmp[0], 24); + ret =3D _rtw_pktfile_read(&pktfile, &tmp[0], 24); + if (ret < 0) + return ret; =20 pattrib->dhcp_pkt =3D 0; if (pktfile.pkt_len > 282) {/* MINIMUM_DHCP_PACKET_SIZE) { */ @@ -1040,6 +1048,8 @@ s32 rtw_xmitframe_coalesce(struct adapter *padapter, = struct sk_buff *pkt, struct s32 bmcst =3D is_multicast_ether_addr(pattrib->ra); s32 res =3D _SUCCESS; =20 + signed int ret; + if (!pxmitframe->buf_addr) return _FAIL; =20 @@ -1054,7 +1064,9 @@ s32 rtw_xmitframe_coalesce(struct adapter *padapter, = struct sk_buff *pkt, struct } =20 _rtw_open_pktfile(pkt, &pktfile); - _rtw_pktfile_read(&pktfile, NULL, pattrib->pkt_hdrlen); + ret =3D _rtw_pktfile_read(&pktfile, NULL, pattrib->pkt_hdrlen); + if (ret < 0) + return ret; =20 frg_inx =3D 0; frg_len =3D pxmitpriv->frag_len - 4;/* 2346-4 =3D 2342 */ @@ -1096,6 +1108,9 @@ s32 rtw_xmitframe_coalesce(struct adapter *padapter, = struct sk_buff *pkt, struct mem_sz =3D _rtw_pktfile_read(&pktfile, pframe, mpdu_len); } =20 + if (mem_sz < 0) + return mem_sz; + pframe +=3D mem_sz; =20 if ((pattrib->icv_len > 0) && (pattrib->bswenc)) { diff --git a/drivers/staging/rtl8723bs/include/xmit_osdep.h b/drivers/stagi= ng/rtl8723bs/include/xmit_osdep.h index 8704dced593a..b68277f3759b 100644 --- a/drivers/staging/rtl8723bs/include/xmit_osdep.h +++ b/drivers/staging/rtl8723bs/include/xmit_osdep.h @@ -35,7 +35,7 @@ void rtw_os_xmit_resource_free(struct adapter *padapter, = struct xmit_buf *pxmitb =20 extern uint rtw_remainder_len(struct pkt_file *pfile); extern void _rtw_open_pktfile(struct sk_buff *pkt, struct pkt_file *pfile); -extern uint _rtw_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen); +extern int _rtw_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen); extern signed int rtw_endofpktfile(struct pkt_file *pfile); =20 extern void rtw_os_pkt_complete(struct adapter *padapter, struct sk_buff *= pkt); diff --git a/drivers/staging/rtl8723bs/os_dep/xmit_linux.c b/drivers/stagin= g/rtl8723bs/os_dep/xmit_linux.c index 944b9c724b32..5b9b959e23ca 100644 --- a/drivers/staging/rtl8723bs/os_dep/xmit_linux.c +++ b/drivers/staging/rtl8723bs/os_dep/xmit_linux.c @@ -21,15 +21,19 @@ void _rtw_open_pktfile(struct sk_buff *pktptr, struct p= kt_file *pfile) pfile->cur_buffer =3D pfile->buf_start; } =20 -uint _rtw_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen) +int _rtw_pktfile_read(struct pkt_file *pfile, u8 *rmem, uint rlen) { - uint len =3D 0; + int ret; + int len =3D 0; =20 len =3D rtw_remainder_len(pfile); len =3D (rlen > len) ? len : rlen; =20 - if (rmem) - skb_copy_bits(pfile->pkt, pfile->buf_len - pfile->pkt_len, rmem, len); + if (rmem) { + ret =3D skb_copy_bits(pfile->pkt, pfile->buf_len - pfile->pkt_len, rmem,= len); + if (ret < 0) + return ret; + } =20 pfile->cur_addr +=3D len; pfile->pkt_len -=3D len; --=20 2.43.0