Patch "cifs: Remove intermediate object of failed create reparse call" has been added to the 6.11-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    cifs: Remove intermediate object of failed create reparse call

to the 6.11-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cifs-remove-intermediate-object-of-failed-create-rep.patch
and it can be found in the queue-6.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 98d0374e09996ce32589d82073435a6b630abc79
Author: Pali Rohár <pali@xxxxxxxxxx>
Date:   Mon Sep 30 22:25:10 2024 +0200

    cifs: Remove intermediate object of failed create reparse call
    
    [ Upstream commit c9432ad5e32f066875b1bf95939c363bc46d6a45 ]
    
    If CREATE was successful but SMB2_OP_SET_REPARSE failed then remove the
    intermediate object created by CREATE. Otherwise empty object stay on the
    server when reparse call failed.
    
    This ensures that if the creating of special files is unsupported by the
    server then no empty file stay on the server as a result of unsupported
    operation.
    
    Fixes: 102466f303ff ("smb: client: allow creating special files via reparse points")
    Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
    Acked-by: Paulo Alcantara (Red Hat) <pc@xxxxxxxxxxxxx>
    Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/smb/client/smb2inode.c b/fs/smb/client/smb2inode.c
index 11a1c53c64e0b..a6dab60e2c01e 100644
--- a/fs/smb/client/smb2inode.c
+++ b/fs/smb/client/smb2inode.c
@@ -1205,9 +1205,12 @@ struct inode *smb2_get_reparse_inode(struct cifs_open_info_data *data,
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	struct cifsFileInfo *cfile;
 	struct inode *new = NULL;
+	int out_buftype[4] = {};
+	struct kvec out_iov[4] = {};
 	struct kvec in_iov[2];
 	int cmds[2];
 	int rc;
+	int i;
 
 	oparms = CIFS_OPARMS(cifs_sb, tcon, full_path,
 			     SYNCHRONIZE | DELETE |
@@ -1228,7 +1231,7 @@ struct inode *smb2_get_reparse_inode(struct cifs_open_info_data *data,
 		cmds[1] = SMB2_OP_POSIX_QUERY_INFO;
 		cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
 		rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, &oparms,
-				      in_iov, cmds, 2, cfile, NULL, NULL, NULL);
+				      in_iov, cmds, 2, cfile, out_iov, out_buftype, NULL);
 		if (!rc) {
 			rc = smb311_posix_get_inode_info(&new, full_path,
 							 data, sb, xid);
@@ -1237,12 +1240,29 @@ struct inode *smb2_get_reparse_inode(struct cifs_open_info_data *data,
 		cmds[1] = SMB2_OP_QUERY_INFO;
 		cifs_get_writable_path(tcon, full_path, FIND_WR_ANY, &cfile);
 		rc = smb2_compound_op(xid, tcon, cifs_sb, full_path, &oparms,
-				      in_iov, cmds, 2, cfile, NULL, NULL, NULL);
+				      in_iov, cmds, 2, cfile, out_iov, out_buftype, NULL);
 		if (!rc) {
 			rc = cifs_get_inode_info(&new, full_path,
 						 data, sb, xid, NULL);
 		}
 	}
+
+
+	/*
+	 * If CREATE was successful but SMB2_OP_SET_REPARSE failed then
+	 * remove the intermediate object created by CREATE. Otherwise
+	 * empty object stay on the server when reparse call failed.
+	 */
+	if (rc &&
+	    out_iov[0].iov_base != NULL && out_buftype[0] != CIFS_NO_BUFFER &&
+	    ((struct smb2_hdr *)out_iov[0].iov_base)->Status == STATUS_SUCCESS &&
+	    (out_iov[1].iov_base == NULL || out_buftype[1] == CIFS_NO_BUFFER ||
+	     ((struct smb2_hdr *)out_iov[1].iov_base)->Status != STATUS_SUCCESS))
+		smb2_unlink(xid, tcon, full_path, cifs_sb, NULL);
+
+	for (i = 0; i < ARRAY_SIZE(out_buftype); i++)
+		free_rsp_buf(out_buftype[i], out_iov[i].iov_base);
+
 	return rc ? ERR_PTR(rc) : new;
 }