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bcachefs: Fix unsafety in bch2_dirent_name_bytes()

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Reported-by: syzbot+84fa6fb8c7f98b93cdea@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-05-22 19:14:08 -04:00
parent 2ba24864d2
commit 2195b755eb
1 changed files with 3 additions and 0 deletions
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3
fs/bcachefs/dirent.c
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@ -15,6 +15,9 @@
static unsigned bch2_dirent_name_bytes(struct bkey_s_c_dirent d)
{
if (bkey_val_bytes(d.k) < offsetof(struct bch_dirent, d_name))
return 0;
unsigned bkey_u64s = bkey_val_u64s(d.k);
unsigned bkey_bytes = bkey_u64s * sizeof(u64);
u64 last_u64 = ((u64*)d.v)[bkey_u64s - 1];