[PATCH-V2] [fs/9p] Fix NULL point deref in v9fs_dir_release

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changes from v1:
Now checking fid instead of filp.

There are situations in VFS where we endup calling v9fs_dir_release() before
even we instantiate the fid in filp. Hence the check.

Signed-off-by: Venkateswararao Jujjuri <jvrao@xxxxxxxxxxxxxxxxxx>
---
 fs/9p/vfs_dir.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 16c8a2a..5b01842 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -291,6 +291,8 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
 	struct p9_fid *fid;
 
 	fid = filp->private_data;
+	if (!fid)
+		return 0;
 	P9_DPRINTK(P9_DEBUG_VFS,
 			"inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
 	filemap_write_and_wait(inode->i_mapping);
-- 
1.6.5.2

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