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bcachefs: Fix a slab-out-of-bounds

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In __bch2_alloc_to_v4_mut(), we overrun the buffer we allocate if the
alloc key had backpointers stored in it (which we no longer support).

Fix this with a max() call.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-04-16 07:10:46 -04:00
parent 853b7393c2
commit 615fccada5
1 changed files with 1 additions and 1 deletions
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2
fs/bcachefs/alloc_background.c
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@ -479,7 +479,7 @@ __bch2_alloc_to_v4_mut(struct btree_trans *trans, struct bkey_s_c k)
{
struct bkey_i_alloc_v4 *ret;
ret = bch2_trans_kmalloc(trans, sizeof(struct bkey_i_alloc_v4));
ret = bch2_trans_kmalloc(trans, max(bkey_bytes(k.k), sizeof(struct bkey_i_alloc_v4)));
if (IS_ERR(ret))
return ret;