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cifs: clarify SMB1 code for UnixCreateHardLink

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Coverity 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).  This doesn't change the address but
makes it slightly clearer.

Addresses-Coverity: 711529 ("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 17:46:23 -05:00
parent 01cf30825c
commit 819f916c83
2 changed files with 3 additions and 1 deletions
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1
fs/cifs/cifspdu.h
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@ -1785,6 +1785,7 @@ struct smb_com_transaction2_sfi_req {
__u16 Fid;
__le16 InformationLevel;
__u16 Reserved4;
__u8 payload[];
} __attribute__((packed));
struct smb_com_transaction2_sfi_rsp {

3
fs/cifs/cifssmb.c
View File

@ -3009,7 +3009,8 @@ createHardLinkRetry:
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, fromName,