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| author | Dave Kleikamp <shaggy@linux.vnet.ibm.com> | 2009-08-31 11:07:12 -0400 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2009-09-01 22:35:01 +0000 |
| commit | 6ab409b53dcaf28f83d518a6702f904b7cee3f41 (patch) | |
| tree | 050bfb690ac9df049343034681478a5bb174a823 /fs/cifs/inode.c | |
| parent | 1b49c5566136455764a8d17ead25784f534c202d (diff) | |
| download | lwn-6ab409b53dcaf28f83d518a6702f904b7cee3f41.tar.gz lwn-6ab409b53dcaf28f83d518a6702f904b7cee3f41.zip | |
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>
Diffstat (limited to 'fs/cifs/inode.c')
| -rw-r--r-- | fs/cifs/inode.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index 82d83839655e..1f09c7619319 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -800,7 +800,7 @@ set_via_filehandle: 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 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs, __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 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs) 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, |