tree c362637b9b051f056e38ff9cfee766509ef31a6e
parent f8935566372c579cf9076d344a76e7781365c6e3
author Johannes Thumshirn <jth@kernel.org> 1575551997 +0100
committer David Sterba <dsterba@suse.com> 1579534852 +0100

btrfs: fix possible NULL-pointer dereference in integrity checks

A user reports a possible NULL-pointer dereference in
btrfsic_process_superblock(). We are assigning state->fs_info to a local
fs_info variable and afterwards checking for the presence of state.

While we would BUG_ON() a NULL state anyways, we can also just remove
the local fs_info copy, as fs_info is only used once as the first
argument for btrfs_num_copies(). There we can just pass in
state->fs_info as well.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205003
Signed-off-by: Johannes Thumshirn <jth@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>