GFS2: Stop looking for free blocks at end of rgrp

This patch adds a return code check after calling function
gfs2_rbm_from_block while determining the free extent size.
That way, when the end of an rgrp is reached, it won't try
to process unaligned blocks after the end.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 738b3888adc6..712dd4fd8641 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -350,10 +350,14 @@ static u32 gfs2_free_extlen(const struct gfs2_rbm *rrbm, u32 len)
                 BUG_ON(len < chunk_size);
                 len -= chunk_size;
                 block = gfs2_rbm_to_block(&rbm);
-                gfs2_rbm_from_block(&rbm, block + chunk_size);
-                n_unaligned = 3;
-                if (ptr)
+                if (gfs2_rbm_from_block(&rbm, block + chunk_size)) {
+                        n_unaligned = 0;
                         break;
+                }
+                if (ptr) {
+                        n_unaligned = 3;
+                        break;
+                }
                 n_unaligned = len & 3;
         }