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CIFS: Clarify SMB1 code for UnixCreateSymLink

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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 creating SMB1 symlinks when using the Unix
extensions.  This doesn't change the address but
makes it slightly clearer.

Addresses-Coverity: 711530 ("Out of bounds read")
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French
2021-07-01 20:44:27 -05:00
parent 819f916c83
commit ded2d99cef
1 changed files with 2 additions and 1 deletions
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3
fs/cifs/cifssmb.c
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@@ -2925,7 +2925,8 @@ CIFSUnixCreateSymLink(const unsigned int xid, struct cifs_tcon *tcon,
InformationLevel) - 4;
offset = param_offset + params;
data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
/* SMB offsets are from the beginning of SMB which is 4 bytes in, after RFC1001 field */
data_offset = (char *)pSMB + offset + 4;
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
name_len_target =
cifsConvertToUTF16((__le16 *) data_offset, toName,