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smb3: missing inode locks in punch hole

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smb3 fallocate punch hole was not grabbing the inode or filemap_invalidate
locks so could have race with pagemap reinstantiating the page.

Cc: stable@vger.kernel.org
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
David Howells 2022-08-23 02:10:56 -05:00 committed by Steve French
parent c919c164fc
commit ba0803050d
1 changed files with 6 additions and 6 deletions
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12
fs/cifs/smb2ops.c
View file

@ -3384,7 +3384,7 @@ static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
loff_t offset, loff_t len)
{
struct inode *inode;
struct inode *inode = file_inode(file);
struct cifsFileInfo *cfile = file->private_data;
struct file_zero_data_information fsctl_buf;
long rc;
@ -3393,14 +3393,12 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
xid = get_xid();
inode = d_inode(cfile->dentry);
inode_lock(inode);
/* Need to make file sparse, if not already, before freeing range. */
/* Consider adding equivalent for compressed since it could also work */
if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
rc = -EOPNOTSUPP;
free_xid(xid);
return rc;
goto out;
}
filemap_invalidate_lock(inode->i_mapping);
@ -3420,8 +3418,10 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
(char *)&fsctl_buf,
sizeof(struct file_zero_data_information),
CIFSMaxBufSize, NULL, NULL);
free_xid(xid);
filemap_invalidate_unlock(inode->i_mapping);
out:
inode_unlock(inode);
free_xid(xid);
return rc;
}