Btrfs: add a helper to retrive extent inline ref type
authorLiu Bo <bo.li.liu@oracle.com>
Fri, 18 Aug 2017 21:15:18 +0000 (15:15 -0600)
committerDavid Sterba <dsterba@suse.com>
Mon, 21 Aug 2017 15:47:42 +0000 (17:47 +0200)
commit167ce953ca55bdee20fe56c3c0fa51002435f745
treeb85800ec47dd67e42d969c6c53a0257bae58c8a1
parentaf1cbe0a66cb9e6c3f2acf7f0a7fc647b5dc4f2f
Btrfs: add a helper to retrive extent inline ref type

An invalid value of extent inline ref type may be read from a
malicious image which may force btrfs to crash.

This adds a helper which does sanity check for the ref type, so we can
know if it's sane, return he type, otherwise return an error.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ minimal tweak const types, causing warnings due to other cleanup patches ]
Signed-off-by: David Sterba <dsterba@suse.com>
fs/btrfs/ctree.h
fs/btrfs/extent-tree.c