ANDROID: sdcardfs: Check for NULL in revalidate

If the inode is in the process of being evicted,
the top value may be NULL.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Bug: 38502532
Change-Id: I0b9d04aab621e0398d44d1c5dc53293106aa5f89

diff --git a/fs/sdcardfs/dentry.c b/fs/sdcardfs/dentry.c
index 83ae9103a0f6c596c868f7b4e93bfd27bbb0a27d..13da7e5245bd5b191ae2d7e08f32ac69e029205d 100644 (file)
--- a/fs/sdcardfs/dentry.c
+++ b/fs/sdcardfs/dentry.c
@@ -109,14 +109,16 @@ static int sdcardfs_d_revalidate(struct dentry *dentry, unsigned int flags)
                goto out;
 
        /* If our top's inode is gone, we may be out of date */
-       inode = d_inode(dentry);
+       inode = igrab(d_inode(dentry));
        if (inode) {
                data = top_data_get(SDCARDFS_I(inode));
-               if (data->abandoned) {
+               if (!data || data->abandoned) {
                        d_drop(dentry);
                        err = 0;
                }
-               data_put(data);
+               if (data)
+                       data_put(data);
+               iput(inode);
        }
 
 out: