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cifs: Check for existing directory when opening file with O_CREAT

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When opening a file with O_CREAT flag, check to see if the file opened
is an existing directory.

This prevents the directory from being opened which subsequently causes
a crash when the close function for directories cifs_closedir() is called
which frees up the file->private_data memory while the file is still
listed on the open file list for the tcon.

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
CC: Stable <stable@vger.kernel.org>
Reported-by: Xiaoli Feng <xifeng@redhat.com>
This commit is contained in:
Sachin Prabhu 2016-07-07 21:28:27 +01:00 committed by Steve French
parent 5b23c97d7e
commit 8d9535b6ef
1 changed files with 21 additions and 3 deletions
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24
fs/cifs/dir.c
View file

@ -229,6 +229,13 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
goto cifs_create_get_file_info;
}
if (S_ISDIR(newinode->i_mode)) {
CIFSSMBClose(xid, tcon, fid->netfid);
iput(newinode);
rc = -EISDIR;
goto out;
}
if (!S_ISREG(newinode->i_mode)) {
/*
* The server may allow us to open things like
@ -399,10 +406,14 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
if (rc != 0) {
cifs_dbg(FYI, "Create worked, get_inode_info failed rc = %d\n",
rc);
if (server->ops->close)
server->ops->close(xid, tcon, fid);
goto out;
goto out_err;
}
if (S_ISDIR(newinode->i_mode)) {
rc = -EISDIR;
goto out_err;
}
d_drop(direntry);
d_add(direntry, newinode);
@ -410,6 +421,13 @@ cifs_do_create(struct inode *inode, struct dentry *direntry, unsigned int xid,
kfree(buf);
kfree(full_path);
return rc;
out_err:
if (server->ops->close)
server->ops->close(xid, tcon, fid);
if (newinode)
iput(newinode);
goto out;
}
int