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CIFS: Clarify SMB1 code for POSIX delete file

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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 CIFSPOSIXDelFile. This changeset
doesn't change the address but makes it slightly clearer.

Addresses-Coverity: 711519 ("Out of bounds write")
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2021-07-22 14:35:15 -05:00
parent 21a6491099
commit 7b09d4e0be
1 changed files with 5 additions and 2 deletions
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7
fs/cifs/cifssmb.c
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@ -873,8 +873,11 @@ PsxDelete:
InformationLevel) - 4;
offset = param_offset + params;
/* Setup pointer to Request Data (inode type) */
pRqD = (struct unlink_psx_rq *)(((char *)&pSMB->hdr.Protocol) + offset);
/* Setup pointer to Request Data (inode type).
* Note that SMB offsets are from the beginning of SMB which is 4 bytes
* in, after RFC1001 field
*/
pRqD = (struct unlink_psx_rq *)((char *)(pSMB) + offset + 4);
pRqD->type = cpu_to_le16(type);
pSMB->ParameterOffset = cpu_to_le16(param_offset);
pSMB->DataOffset = cpu_to_le16(offset);