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cifs: Fix cifs_query_path_info() for Windows NT servers

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For TRANS2 QUERY_PATH_INFO request when the path does not exist, the
Windows NT SMB server returns error response STATUS_OBJECT_NAME_NOT_FOUND
or ERRDOS/ERRbadfile without the SMBFLG_RESPONSE flag set. Similarly it
returns STATUS_DELETE_PENDING when the file is being deleted. And looks
like that any error response from TRANS2 QUERY_PATH_INFO does not have
SMBFLG_RESPONSE flag set.

So relax check in check_smb_hdr() for detecting if the packet is response
for this special case.

This change fixes stat() operation against Windows NT SMB servers and also
all operations which depends on -ENOENT result from stat like creat() or
mkdir().

Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Pali Rohár
2024-12-31 16:06:22 +01:00
committed by Steve French
parent 56e84c64fc
commit a3e771afbb
1 changed files with 8 additions and 0 deletions
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8
fs/smb/client/misc.c
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@@ -326,6 +326,14 @@ check_smb_hdr(struct smb_hdr *smb)
if (smb->Command == SMB_COM_LOCKING_ANDX)
return 0;
/*
* Windows NT server returns error resposne (e.g. STATUS_DELETE_PENDING
* or STATUS_OBJECT_NAME_NOT_FOUND or ERRDOS/ERRbadfile or any other)
* for some TRANS2 requests without the RESPONSE flag set in header.
*/
if (smb->Command == SMB_COM_TRANSACTION2 && smb->Status.CifsError != 0)
return 0;
cifs_dbg(VFS, "Server sent request, not response. mid=%u\n",
get_mid(smb));
return 1;