CVE-2022-50766
Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: set generation before calling btrfs_clean_tree_block in btrfs_init_new_buffer syzbot is reporting uninit-value in btrfs_clean_tree_block() [1], for commit bc877d285ca3dba2 ("btrfs: Deduplicate extent_buffer init code") missed that btrfs_set_header_generation() in btrfs_init_new_buffer() must not be moved to after clean_tree_block() because clean_tree_block() is calling btrfs_header_generation() since commit 55c69072d6bd5be1 ("Btrfs: Fix extent_buffer usage when nodesize != leafsize"). Since memzero_extent_buffer() will reset "struct btrfs_header" part, we can't move btrfs_set_header_generation() to before memzero_extent_buffer(). Just re-add btrfs_set_header_generation() before btrfs_clean_tree_block().
How to fix
- Linux Linux0a408c6212c16b9a2a1141d3c531247582ef8101, a687c2890fe4a2acaac6941fa4097a1264d8f3eb, 89bc41c92d10b905c60f6ec13c9ef664a3555c54, cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | bc877d285ca3dba24c52406946a4a69847cc7422 ≤ v < 0a408c6212c16b9a2a1141d3c531247582ef8101, bc877d285ca3dba24c52406946a4a69847cc7422 ≤ v < a687c2890fe4a2acaac6941fa4097a1264d8f3eb, bc877d285ca3dba24c52406946a4a69847cc7422 ≤ v < 89bc41c92d10b905c60f6ec13c9ef664a3555c54, bc877d285ca3dba24c52406946a4a69847cc7422 ≤ v < cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38, 4.19 | 0a408c6212c16b9a2a1141d3c531247582ef8101, a687c2890fe4a2acaac6941fa4097a1264d8f3eb, 89bc41c92d10b905c60f6ec13c9ef664a3555c54, cbddcc4fa3443fe8cfb2ff8e210deb1f6a0eea38 |
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