[PATCH 1/9] gfs2: Fix gfs2_drevalidate NULL pointer dereference

[Andreas Gruenbacher <agruenba@redhat.com>]

Commit dd00aaeb3432 added an RCU-safe way of computing d_inode(parent)
to gfs2_drevalidate() to support the LOOKUP_RCU flag, but then failed to
convert one of the instances of d_inode(parent) to its RCU-safe
replacement.  This manifested as a NULL pointer dereference.  Fix that.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Fixes: dd00aaeb3432 ("gfs2: Use GL_NOBLOCK flag for non-blocking lookups")
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 fs/gfs2/dentry.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/gfs2/dentry.c b/fs/gfs2/dentry.c
index 177f1f41f225..c6483fb98624 100644
--- a/fs/gfs2/dentry.c
+++ b/fs/gfs2/dentry.c
@@ -72,7 +72,7 @@ static int gfs2_drevalidate(struct dentry *dentry, unsigned int flags)
 			goto out;
 	}
 
-	error = gfs2_dir_check(d_inode(parent), &dentry->d_name, ip);
+	error = gfs2_dir_check(dinode, &dentry->d_name, ip);
 	valid = inode ? !error : (error == -ENOENT);
 
 	if (!had_lock)
-- 
2.43.0