ext4: Initialize the new group descriptor when resizing the filesystem

Make sure all of the fields of the group descriptor are properly
initialized.  Previously, we allowed bg_flags field to be contain
random garbage, which could trigger non-deterministic behavior,
including a kernel OOPS.

http://bugzilla.kernel.org/show_bug.cgi?id=12433

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index c328be5d6885..c06886abd658 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -861,12 +861,13 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
         gdp = (struct ext4_group_desc *)((char *)primary->b_data +
                                          gdb_off * EXT4_DESC_SIZE(sb));
 
+        memset(gdp, 0, EXT4_DESC_SIZE(sb));
         ext4_block_bitmap_set(sb, gdp, input->block_bitmap); /* LV FIXME */
         ext4_inode_bitmap_set(sb, gdp, input->inode_bitmap); /* LV FIXME */
         ext4_inode_table_set(sb, gdp, input->inode_table); /* LV FIXME */
         ext4_free_blks_set(sb, gdp, input->free_blocks_count);
         ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
-        gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED);
+        gdp->bg_flags = cpu_to_le16(EXT4_BG_INODE_ZEROED);
         gdp->bg_checksum = ext4_group_desc_csum(sbi, input->group, gdp);
 
         /*