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Btrfs: fix use after free when close_ctree frees the orphan_rsv 

Near the end of close_ctree, we're calling btrfs_free_block_rsv
to free up the orphan rsv.  The problem is this call updates the
space_info, which has already been freed.

This adds a new __ function that directly calls kfree instead of trying
to update the space infos.

Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Chris Mason 2015-04-06 18:17:00 -07:00
parent 1bbc621ef2
commit cdfb080e18
3 changed files with 7 additions and 1 deletions
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1
fs/btrfs/ctree.h
View File

@ -3470,6 +3470,7 @@ struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root,
unsigned short type);
void btrfs_free_block_rsv(struct btrfs_root *root,
struct btrfs_block_rsv *rsv);
void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv);
int btrfs_block_rsv_add(struct btrfs_root *root,
struct btrfs_block_rsv *block_rsv, u64 num_bytes,
enum btrfs_reserve_flush_enum flush);

2
fs/btrfs/disk-io.c
View File

@ -3766,7 +3766,7 @@ void close_ctree(struct btrfs_root *root)
btrfs_free_stripe_hash_table(fs_info);
btrfs_free_block_rsv(root, root->orphan_block_rsv);
__btrfs_free_block_rsv(root->orphan_block_rsv);
root->orphan_block_rsv = NULL;
lock_chunks(root);

5
fs/btrfs/extent-tree.c
View File

@ -4918,6 +4918,11 @@ void btrfs_free_block_rsv(struct btrfs_root *root,
kfree(rsv);
}
void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv)
{
kfree(rsv);
}
int btrfs_block_rsv_add(struct btrfs_root *root,
struct btrfs_block_rsv *block_rsv, u64 num_bytes,
enum btrfs_reserve_flush_enum flush)