reiserfs: fix memset byte count during resize

Correct the memset in reiserfs_resize to clear the memory allocated for the
new bitmap info structs.  Previously, it would clear the memory used by the
old size.  Depending on the contents of memory, this could cause incorrect
caching behavior for bitmap blocks in the newly allocated area.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/reiserfs/resize.c b/fs/reiserfs/resize.c
index 976cc78..3bec2f9 100644 (file)
--- a/fs/reiserfs/resize.c
+++ b/fs/reiserfs/resize.c
@@ -119,7 +119,7 @@ int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
                        return -ENOMEM;
                }
                memset(bitmap, 0,
-                      sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
+                      sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
                for (i = 0; i < bmap_nr; i++)
                        bitmap[i] = old_bitmap[i];