cifs: Replace wrtPending with a real reference count
Currently, cifs_close() tries to wait until all I/O is complete and then
frees the file private data. If I/O does not completely in a reasonable
amount of time it frees the structure anyway, leaving a potential use-
after-free situation.
This patch changes the wrtPending counter to a complete reference count and
lets the last user free the structure.
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Tested-by: Shirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifsacl.c b/fs/cifs/cifsacl.c
index 6941c22..7dfe084 100644
--- a/fs/cifs/cifsacl.c
+++ b/fs/cifs/cifsacl.c
@@ -607,7 +607,7 @@
return get_cifs_acl_by_path(cifs_sb, path, pacllen);
pntsd = get_cifs_acl_by_fid(cifs_sb, open_file->netfid, pacllen);
- atomic_dec(&open_file->wrtPending);
+ cifsFileInfo_put(open_file);
return pntsd;
}
@@ -665,7 +665,7 @@
return set_cifs_acl_by_path(cifs_sb, path, pnntsd, acllen);
rc = set_cifs_acl_by_fid(cifs_sb, open_file->netfid, pnntsd, acllen);
- atomic_dec(&open_file->wrtPending);
+ cifsFileInfo_put(open_file);
return rc;
}
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index f100399..6cfc81a 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -351,11 +351,24 @@
bool closePend:1; /* file is marked to close */
bool invalidHandle:1; /* file closed via session abend */
bool messageMode:1; /* for pipes: message vs byte mode */
- atomic_t wrtPending; /* handle in use - defer close */
+ atomic_t count; /* reference count */
struct mutex fh_mutex; /* prevents reopen race after dead ses*/
struct cifs_search_info srch_inf;
};
+/* Take a reference on the file private data */
+static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
+{
+ atomic_inc(&cifs_file->count);
+}
+
+/* Release a reference on the file private data */
+static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
+{
+ if (atomic_dec_and_test(&cifs_file->count))
+ kfree(cifs_file);
+}
+
/*
* One of these for each file inode
*/
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 4326ffd..a6424cf 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -153,7 +153,7 @@
mutex_init(&pCifsFile->fh_mutex);
mutex_init(&pCifsFile->lock_mutex);
INIT_LIST_HEAD(&pCifsFile->llist);
- atomic_set(&pCifsFile->wrtPending, 0);
+ atomic_set(&pCifsFile->count, 1);
/* set the following in open now
pCifsFile->pfile = file; */
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index c34b7f8..fa7beac 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -53,11 +53,9 @@
private_data->pInode = inode;
private_data->invalidHandle = false;
private_data->closePend = false;
- /* we have to track num writers to the inode, since writepages
- does not tell us which handle the write is for so there can
- be a close (overlapping with write) of the filehandle that
- cifs_writepages chose to use */
- atomic_set(&private_data->wrtPending, 0);
+ /* Initialize reference count to one. The private data is
+ freed on the release of the last reference */
+ atomic_set(&private_data->count, 1);
return private_data;
}
@@ -643,7 +641,7 @@
if (!pTcon->need_reconnect) {
write_unlock(&GlobalSMBSeslock);
timeout = 2;
- while ((atomic_read(&pSMBFile->wrtPending) != 0)
+ while ((atomic_read(&pSMBFile->count) != 1)
&& (timeout <= 2048)) {
/* Give write a better chance to get to
server ahead of the close. We do not
@@ -657,8 +655,6 @@
msleep(timeout);
timeout *= 4;
}
- if (atomic_read(&pSMBFile->wrtPending))
- cERROR(1, ("close with pending write"));
if (!pTcon->need_reconnect &&
!pSMBFile->invalidHandle)
rc = CIFSSMBClose(xid, pTcon,
@@ -681,24 +677,7 @@
list_del(&pSMBFile->flist);
list_del(&pSMBFile->tlist);
write_unlock(&GlobalSMBSeslock);
- timeout = 10;
- /* We waited above to give the SMBWrite a chance to issue
- on the wire (so we do not get SMBWrite returning EBADF
- if writepages is racing with close. Note that writepages
- does not specify a file handle, so it is possible for a file
- to be opened twice, and the application close the "wrong"
- file handle - in these cases we delay long enough to allow
- the SMBWrite to get on the wire before the SMB Close.
- We allow total wait here over 45 seconds, more than
- oplock break time, and more than enough to allow any write
- to complete on the server, or to time out on the client */
- while ((atomic_read(&pSMBFile->wrtPending) != 0)
- && (timeout <= 50000)) {
- cERROR(1, ("writes pending, delay free of handle"));
- msleep(timeout);
- timeout *= 8;
- }
- kfree(file->private_data);
+ cifsFileInfo_put(file->private_data);
file->private_data = NULL;
} else
rc = -EBADF;
@@ -1236,7 +1215,7 @@
if (!open_file->invalidHandle) {
/* found a good file */
/* lock it so it will not be closed on us */
- atomic_inc(&open_file->wrtPending);
+ cifsFileInfo_get(open_file);
read_unlock(&GlobalSMBSeslock);
return open_file;
} /* else might as well continue, and look for
@@ -1276,7 +1255,7 @@
if (open_file->pfile &&
((open_file->pfile->f_flags & O_RDWR) ||
(open_file->pfile->f_flags & O_WRONLY))) {
- atomic_inc(&open_file->wrtPending);
+ cifsFileInfo_get(open_file);
if (!open_file->invalidHandle) {
/* found a good writable file */
@@ -1293,7 +1272,7 @@
else { /* start over in case this was deleted */
/* since the list could be modified */
read_lock(&GlobalSMBSeslock);
- atomic_dec(&open_file->wrtPending);
+ cifsFileInfo_put(open_file);
goto refind_writable;
}
}
@@ -1309,7 +1288,7 @@
read_lock(&GlobalSMBSeslock);
/* can not use this handle, no write
pending on this one after all */
- atomic_dec(&open_file->wrtPending);
+ cifsFileInfo_put(open_file);
if (open_file->closePend) /* list could have changed */
goto refind_writable;
@@ -1373,7 +1352,7 @@
if (open_file) {
bytes_written = cifs_write(open_file->pfile, write_data,
to-from, &offset);
- atomic_dec(&open_file->wrtPending);
+ cifsFileInfo_put(open_file);
/* Does mm or vfs already set times? */
inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
if ((bytes_written > 0) && (offset))
@@ -1562,7 +1541,7 @@
bytes_to_write, offset,
&bytes_written, iov, n_iov,
long_op);
- atomic_dec(&open_file->wrtPending);
+ cifsFileInfo_put(open_file);
cifs_update_eof(cifsi, offset, bytes_written);
if (rc || bytes_written < bytes_to_write) {
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 82d8383..1f09c76 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -800,7 +800,7 @@
if (open_file == NULL)
CIFSSMBClose(xid, pTcon, netfid);
else
- atomic_dec(&open_file->wrtPending);
+ cifsFileInfo_put(open_file);
out:
return rc;
}
@@ -1635,7 +1635,7 @@
__u32 npid = open_file->pid;
rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
npid, false);
- atomic_dec(&open_file->wrtPending);
+ cifsFileInfo_put(open_file);
cFYI(1, ("SetFSize for attrs rc = %d", rc));
if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
unsigned int bytes_written;
@@ -1790,7 +1790,7 @@
u16 nfid = open_file->netfid;
u32 npid = open_file->pid;
rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
- atomic_dec(&open_file->wrtPending);
+ cifsFileInfo_put(open_file);
} else {
rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
cifs_sb->local_nls,