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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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618763958b
Commit13cfb7334emade cifs_ioctl use the tlink attached to the cifsFileInfo for a filp. This ignores the case of an open directory however, which in CIFS can have a NULL private_data until a readdir is done on it. This patch re-adds the NULL pointer checks that were removed in commit50ae28f01and moves the setting of tcon and "caps" variables lower. Long term, a better fix would be to establish a f_op->open routine for directories that populates that field at open time, but that requires some other changes to how readdir calls are handled. Reported-by: Kjell Rune Skaaraas <kjella79@yahoo.no> Reviewed-and-Tested-by: Suresh Jayaraman <sjayaraman@suse.de> Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/*
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* fs/cifs/ioctl.c
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*
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* vfs operations that deal with io control
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*
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* Copyright (C) International Business Machines Corp., 2005,2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "cifsfs.h"
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#define CIFS_IOC_CHECKUMOUNT _IO(0xCF, 2)
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long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
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{
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struct inode *inode = filep->f_dentry->d_inode;
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int rc = -ENOTTY; /* strange error - but the precedent */
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int xid;
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struct cifs_sb_info *cifs_sb;
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#ifdef CONFIG_CIFS_POSIX
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struct cifsFileInfo *pSMBFile = filep->private_data;
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struct cifsTconInfo *tcon;
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__u64 ExtAttrBits = 0;
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__u64 ExtAttrMask = 0;
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__u64 caps;
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#endif /* CONFIG_CIFS_POSIX */
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xid = GetXid();
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cFYI(1, "ioctl file %p cmd %u arg %lu", filep, command, arg);
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cifs_sb = CIFS_SB(inode->i_sb);
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switch (command) {
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case CIFS_IOC_CHECKUMOUNT:
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cFYI(1, "User unmount attempted");
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if (cifs_sb->mnt_uid == current_uid())
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rc = 0;
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else {
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rc = -EACCES;
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cFYI(1, "uids do not match");
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}
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break;
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#ifdef CONFIG_CIFS_POSIX
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case FS_IOC_GETFLAGS:
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if (pSMBFile == NULL)
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break;
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tcon = tlink_tcon(pSMBFile->tlink);
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caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
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if (CIFS_UNIX_EXTATTR_CAP & caps) {
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rc = CIFSGetExtAttr(xid, tcon, pSMBFile->netfid,
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&ExtAttrBits, &ExtAttrMask);
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if (rc == 0)
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rc = put_user(ExtAttrBits &
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FS_FL_USER_VISIBLE,
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(int __user *)arg);
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}
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break;
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case FS_IOC_SETFLAGS:
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if (pSMBFile == NULL)
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break;
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tcon = tlink_tcon(pSMBFile->tlink);
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caps = le64_to_cpu(tcon->fsUnixInfo.Capability);
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if (CIFS_UNIX_EXTATTR_CAP & caps) {
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if (get_user(ExtAttrBits, (int __user *)arg)) {
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rc = -EFAULT;
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break;
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}
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/* rc= CIFSGetExtAttr(xid,tcon,pSMBFile->netfid,
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extAttrBits, &ExtAttrMask);*/
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}
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cFYI(1, "set flags not implemented yet");
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break;
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#endif /* CONFIG_CIFS_POSIX */
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default:
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cFYI(1, "unsupported ioctl");
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break;
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}
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FreeXid(xid);
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return rc;
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}
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