unimore/kernel-hacking-2024-linux-steffo
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bcachefs: Add extra padding in bkey_make_mut_noupdate()

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This fixes a kasan splat in propagate_key_to_snapshot_leaves() -
varint_decode_fast() does reads (that it never uses) up to 7 bytes past
the end of the integer.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-09-23 17:30:59 -04:00
parent f890c8513f
commit 4a8f8fafbd
1 changed files with 2 additions and 1 deletions
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3
fs/bcachefs/btree_update.h
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@ -220,7 +220,8 @@ static inline struct bkey_i *__bch2_bkey_make_mut_noupdate(struct btree_trans *t
if (type && k.k->type != type)
return ERR_PTR(-ENOENT);
mut = bch2_trans_kmalloc_nomemzero(trans, bytes);
/* extra padding for varint_decode_fast... */
mut = bch2_trans_kmalloc_nomemzero(trans, bytes + 8);
if (!IS_ERR(mut)) {
bkey_reassemble(mut, k);