fat: fix d_revalidate oopsen on NFS exports

can't blindly check nd->flags in ->d_revalidate() Signed-off-by: Al Viro <[email protected]>
zarubaf · Mar 10, 2011 · 9177ada · 9177ada
1 parent 8ce84ee
commit 9177ada
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
@@ -43,7 +43,7 @@ static int vfat_revalidate_shortname(struct dentry *dentry)
 
 static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	/* This is not negative dentry. Always valid. */
@@ -54,7 +54,7 @@ static int vfat_revalidate(struct dentry *dentry, struct nameidata *nd)
 
 static int vfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd)
 {
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	/*