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Thu, 30 Apr 2026 15:06:19 -0700 (PDT) Received: from ryzen ([2601:644:8000:5b5d:7285:c2ff:fe45:8a32]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-83515b5b921sm697669b3a.54.2026.04.30.15.06.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2026 15:06:19 -0700 (PDT) From: Rosen Penev To: linux-cifs@vger.kernel.org Cc: Steve French , Paulo Alcantara , Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Bharath SM , samba-technical@lists.samba.org (moderated list:COMMON INTERNET FILE SYSTEM CLIENT (CIFS and SMB3)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH] cifssmb: use struct_offset in memcpy calculations Date: Thu, 30 Apr 2026 15:06:01 -0700 Message-ID: <20260430220601.76266-1-rosenp@gmail.com> X-Mailer: git-send-email 2.54.0 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" It seems W=3D1/FORTIFY_SOURCE is getting confused about the math here. Use struct_offset to point FORTIFY_SOURCE to the correct place. Remove response_data variables and directly apply to memcpy. Simpler and avoids excess casting. Signed-off-by: Rosen Penev --- fs/smb/client/cifssmb.c | 40 +++++++++++++--------------------------- 1 file changed, 13 insertions(+), 27 deletions(-) diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c index 3990a9012264..8598cec5ebbd 100644 --- a/fs/smb/client/cifssmb.c +++ b/fs/smb/client/cifssmb.c @@ -4090,9 +4090,9 @@ CIFSSMBQFileInfo(const unsigned int xid, struct cifs_= tcon *tcon, get_bcc(&pSMBr->hdr), 40); else if (pFindData) { __u16 data_offset =3D le16_to_cpu(pSMBr->t2.DataOffset); - memcpy((char *) pFindData, - (char *) &pSMBr->hdr.Protocol + - data_offset, sizeof(FILE_ALL_INFO)); + memcpy(pFindData, + (char *)pSMBr + struct_offset(pSMBr, hdr.Protocol) + data_offset, + sizeof(FILE_ALL_INFO)); } else rc =3D -ENOMEM; } @@ -4264,9 +4264,8 @@ CIFSSMBUnixQFileInfo(const unsigned int xid, struct c= ifs_tcon *tcon, get_bcc(&pSMBr->hdr), sizeof(FILE_UNIX_BASIC_INFO)); } else { __u16 data_offset =3D le16_to_cpu(pSMBr->t2.DataOffset); - memcpy((char *) pFindData, - (char *) &pSMBr->hdr.Protocol + - data_offset, + memcpy(pFindData, + (char *)pSMBr + struct_offset(pSMBr, hdr.Protocol) + data_offset, sizeof(FILE_UNIX_BASIC_INFO)); } } @@ -4349,9 +4348,8 @@ CIFSSMBUnixQPathInfo(const unsigned int xid, struct c= ifs_tcon *tcon, get_bcc(&pSMBr->hdr), sizeof(FILE_UNIX_BASIC_INFO)); } else { __u16 data_offset =3D le16_to_cpu(pSMBr->t2.DataOffset); - memcpy((char *) pFindData, - (char *) &pSMBr->hdr.Protocol + - data_offset, + memcpy(pFindData, + (char *)pSMBr + struct_offset(pSMBr, hdr.Protocol) + data_offset, sizeof(FILE_UNIX_BASIC_INFO)); } } @@ -5079,7 +5077,6 @@ CIFSSMBQFSAttributeInfo(const unsigned int xid, struc= t cifs_tcon *tcon) /* level 0x105 SMB_QUERY_FILE_SYSTEM_INFO */ TRANSACTION2_QFSI_REQ *pSMB =3D NULL; TRANSACTION2_QFSI_RSP *pSMBr =3D NULL; - FILE_SYSTEM_ATTRIBUTE_INFO *response_data; unsigned int in_len; int rc =3D 0; int bytes_returned =3D 0; @@ -5130,11 +5127,8 @@ CIFSSMBQFSAttributeInfo(const unsigned int xid, stru= ct cifs_tcon *tcon) get_bcc(&pSMBr->hdr), 13); } else { __u16 data_offset =3D le16_to_cpu(pSMBr->t2.DataOffset); - response_data =3D - (FILE_SYSTEM_ATTRIBUTE_INFO - *) (((char *) &pSMBr->hdr.Protocol) + - data_offset); - memcpy(&tcon->fsAttrInfo, response_data, + memcpy(&tcon->fsAttrInfo, + (char *)pSMBr + struct_offset(pSMBr, hdr.Protocol) + data_offset, sizeof(FILE_SYSTEM_ATTRIBUTE_INFO)); } } @@ -5152,7 +5146,6 @@ CIFSSMBQFSDeviceInfo(const unsigned int xid, struct c= ifs_tcon *tcon) /* level 0x104 SMB_QUERY_FILE_SYSTEM_INFO */ TRANSACTION2_QFSI_REQ *pSMB =3D NULL; TRANSACTION2_QFSI_RSP *pSMBr =3D NULL; - FILE_SYSTEM_DEVICE_INFO *response_data; unsigned int in_len; int rc =3D 0; int bytes_returned =3D 0; @@ -5205,11 +5198,8 @@ CIFSSMBQFSDeviceInfo(const unsigned int xid, struct = cifs_tcon *tcon) sizeof(FILE_SYSTEM_DEVICE_INFO)); else { __u16 data_offset =3D le16_to_cpu(pSMBr->t2.DataOffset); - response_data =3D - (FILE_SYSTEM_DEVICE_INFO *) - (((char *) &pSMBr->hdr.Protocol) + - data_offset); - memcpy(&tcon->fsDevInfo, response_data, + memcpy(&tcon->fsDevInfo, + (char *)pSMBr + struct_offset(pSMBr, hdr.Protocol) + data_offset, sizeof(FILE_SYSTEM_DEVICE_INFO)); } } @@ -5227,7 +5217,6 @@ CIFSSMBQFSUnixInfo(const unsigned int xid, struct cif= s_tcon *tcon) /* level 0x200 SMB_QUERY_CIFS_UNIX_INFO */ TRANSACTION2_QFSI_REQ *pSMB =3D NULL; TRANSACTION2_QFSI_RSP *pSMBr =3D NULL; - FILE_SYSTEM_UNIX_INFO *response_data; unsigned int in_len; int rc =3D 0; int bytes_returned =3D 0; @@ -5277,11 +5266,8 @@ CIFSSMBQFSUnixInfo(const unsigned int xid, struct ci= fs_tcon *tcon) get_bcc(&pSMBr->hdr), 13); } else { __u16 data_offset =3D le16_to_cpu(pSMBr->t2.DataOffset); - response_data =3D - (FILE_SYSTEM_UNIX_INFO - *) (((char *) &pSMBr->hdr.Protocol) + - data_offset); - memcpy(&tcon->fsUnixInfo, response_data, + memcpy(&tcon->fsUnixInfo, + (char *)pSMBr + struct_offset(pSMBr, hdr.Protocol) + data_offset, sizeof(FILE_SYSTEM_UNIX_INFO)); } } --=20 2.54.0