CVE-2022-50766

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer<br /> <br /> syzbot is reporting uninit-value in btrfs_clean_tree_block() [1], for<br /> commit bc877d285ca3dba2 ("btrfs: Deduplicate extent_buffer init code")<br /> missed that btrfs_set_header_generation() in btrfs_init_new_buffer() must<br /> not be moved to after clean_tree_block() because clean_tree_block() is<br /> calling btrfs_header_generation() since commit 55c69072d6bd5be1 ("Btrfs:<br /> Fix extent_buffer usage when nodesize != leafsize").<br /> <br /> Since memzero_extent_buffer() will reset "struct btrfs_header" part, we<br /> can&amp;#39;t move btrfs_set_header_generation() to before memzero_extent_buffer().<br /> Just re-add btrfs_set_header_generation() before btrfs_clean_tree_block().