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bcachefs: cryptographic MACs on superblock are not (yet?) supported

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We should add support for cryptographic macs on the superblock - and it
won't be hard, but it'll need an incompatible feature bit (and we have a
new incompatible feature versioning scheme coming).

For now, just add a guard to avoid a dull ptr deref in gen_poly_key().

Reported-by: syzbot+dd3d9835055dacb66f35@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2024-11-28 17:57:55 -05:00
parent 4746ee182a
commit f7f196170d
1 changed files with 2 additions and 1 deletions
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3
fs/bcachefs/super-io.c
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@@ -677,7 +677,8 @@ static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf
}
enum bch_csum_type csum_type = BCH_SB_CSUM_TYPE(sb->sb);
if (csum_type >= BCH_CSUM_NR) {
if (csum_type >= BCH_CSUM_NR ||
bch2_csum_type_is_encryption(csum_type)) {
prt_printf(err, "unknown checksum type %llu", BCH_SB_CSUM_TYPE(sb->sb));
return -BCH_ERR_invalid_sb_csum_type;
}