From: Steve French Date: Wed, 7 Jul 2021 18:34:47 +0000 (-0500) Subject: CIFS: Clarify SMB1 code for rename open file X-Git-Tag: microblaze-v5.15~14^2~5 X-Git-Url: http://git.monstr.eu/?p=linux-2.6-microblaze.git;a=commitdiff_plain;h=f371793d6e13a1387b83a72d7bb2c0e3a9ea654f CIFS: Clarify SMB1 code for rename open file 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 RenameOpenFile. This changeset doesn't change the address but makes it slightly clearer. Addresses-Coverity: 711521 ("Out of bounds write") Reviewed-by: Paulo Alcantara (SUSE) Signed-off-by: Steve French --- diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 0863238ddd20..16bd4cf3bceb 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -2767,7 +2767,8 @@ int CIFSSMBRenameOpenFile(const unsigned int xid, struct cifs_tcon *pTcon, param_offset = offsetof(struct smb_com_transaction2_sfi_req, Fid) - 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; rename_info = (struct set_file_rename *) data_offset; pSMB->MaxParameterCount = cpu_to_le16(2); pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB from sess */