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CIFS: Clarify SMB1 code for POSIX Create

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Coverity also complains about the way we calculate the offset
(starting from the address of a 4 byte array within the
header structure rather than from the beginning of the struct
plus 4 bytes) for SMB1 CIFSPOSIXCreate. This changeset
doesn't change the address but makes it slightly clearer.

Addresses-Coverity: 711518 ("Out of bounds write")
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2021-07-22 13:50:41 -05:00
parent b62366181a
commit 21a6491099
1 changed files with 2 additions and 1 deletions
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3
fs/cifs/cifssmb.c
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@ -1081,7 +1081,8 @@ PsxCreat:
param_offset = offsetof(struct smb_com_transaction2_spi_req,
InformationLevel) - 4;
offset = param_offset + params;
pdata = (OPEN_PSX_REQ *)(((char *)&pSMB->hdr.Protocol) + offset);
/* SMB offsets are from the beginning of SMB which is 4 bytes in, after RFC1001 field */
pdata = (OPEN_PSX_REQ *)((char *)(pSMB) + offset + 4);
pdata->Level = cpu_to_le16(SMB_QUERY_FILE_UNIX_BASIC);
pdata->Permissions = cpu_to_le64(mode);
pdata->PosixOpenFlags = cpu_to_le32(posix_flags);