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authorDave Kleikamp <shaggy@linux.vnet.ibm.com>2009-08-31 11:07:12 -0400
committerSteve French <sfrench@us.ibm.com>2009-09-01 22:35:01 +0000
commit6ab409b53dcaf28f83d518a6702f904b7cee3f41 (patch)
tree050bfb690ac9df049343034681478a5bb174a823 /fs/cifs/inode.c
parent1b49c5566136455764a8d17ead25784f534c202d (diff)
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.c6
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,