From 3c156187b23b66ce205a7d8d93ad6ff567fc6608 Mon Sep 17 00:00:00 2001 From: Jeff Layton Date: Thu, 23 Feb 2012 09:37:45 -0500 Subject: cifs: fix dentry refcount leak when opening a FIFO on lookup commit 5bccda0ebc7c0331b81ac47d39e4b920b198b2cd upstream. The cifs code will attempt to open files on lookup under certain circumstances. What happens though if we find that the file we opened was actually a FIFO or other special file? Currently, the open filehandle just ends up being leaked leading to a dentry refcount mismatch and oops on umount. Fix this by having the code close the filehandle on the server if it turns out not to be a regular file. While we're at it, change this spaghetti if statement into a switch too. Reported-by: CAI Qian Tested-by: CAI Qian Reviewed-by: Shirish Pargaonkar Signed-off-by: Jeff Layton Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/cifs/dir.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) (limited to 'fs/cifs/dir.c') diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c index 16cdd6d..ed5c07b 100644 --- a/fs/cifs/dir.c +++ b/fs/cifs/dir.c @@ -583,10 +583,26 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry, * If either that or op not supported returned, follow * the normal lookup. */ - if ((rc == 0) || (rc == -ENOENT)) + switch (rc) { + case 0: + /* + * The server may allow us to open things like + * FIFOs, but the client isn't set up to deal + * with that. If it's not a regular file, just + * close it and proceed as if it were a normal + * lookup. + */ + if (newInode && !S_ISREG(newInode->i_mode)) { + CIFSSMBClose(xid, pTcon, fileHandle); + break; + } + case -ENOENT: posix_open = true; - else if ((rc == -EINVAL) || (rc != -EOPNOTSUPP)) + case -EOPNOTSUPP: + break; + default: pTcon->broken_posix_open = true; + } } if (!posix_open) rc = cifs_get_inode_info_unix(&newInode, full_path, -- cgit v1.1