Btrfs: fix page leakage

Alloc_dummy_extent_buffer will not free the first page in the eb array if we
fail to allocate a page, fix this.  Thanks,

Reported-by: David Sterba <dave@jikos.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 7dc69b3..64dc93f 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4104,7 +4104,7 @@ struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len)
 
        return eb;
 err:
-       for (i--; i > 0; i--)
+       for (i--; i >= 0; i--)
                __free_page(eb->pages[i]);
        __free_extent_buffer(eb);
        return NULL;