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authorTheodore Ts'o <tytso@mit.edu>2009-02-17 10:58:44 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2009-02-20 14:37:21 -0800
commit06331d79061a3fb0cc63a2e06c183a9c820c85b4 (patch)
treea1523c8c97336d5796bb147087fae49b680e81e9
parentc8b4b2de0fef78500097afb2a114fb632d2951ab (diff)
ext4: Initialize the new group descriptor when resizing the filesystem
(cherry picked from commit fdff73f094e7220602cc3f8959c7230517976412) 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/ext4/resize.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index cfb8e366e229..00704312f4f7 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -860,11 +860,13 @@ 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 */
gdp->bg_free_blocks_count = cpu_to_le16(input->free_blocks_count);
gdp->bg_free_inodes_count = cpu_to_le16(EXT4_INODES_PER_GROUP(sb));
+ gdp->bg_flags = cpu_to_le16(EXT4_BG_INODE_ZEROED);
gdp->bg_checksum = ext4_group_desc_csum(sbi, input->group, gdp);
/*