diff options
| author | Daniel Jordan <daniel.m.jordan@oracle.com> | 2022-11-16 20:28:04 -0500 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2022-11-25 17:39:18 +0800 |
| commit | 57ddfecc72a6c9941d159543e1c0c0a74fe9afdd (patch) | |
| tree | f8f6c9dd7f6b34d3ca82df157e16f21da2ca7de7 /kernel/padata.c | |
| parent | 34c3a47d20ae55b3600fed733bf96eafe9c500d5 (diff) | |
padata: Fix list iterator in padata_do_serial()
list_for_each_entry_reverse() assumes that the iterated list is nonempty
and that every list_head is embedded in the same type, but its use in
padata_do_serial() breaks both rules.
This doesn't cause any issues now because padata_priv and padata_list
happen to have their list fields at the same offset, but we really
shouldn't be relying on that.
Fixes: bfde23ce200e ("padata: unbind parallel jobs from specific CPUs")
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'kernel/padata.c')
| -rw-r--r-- | kernel/padata.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/padata.c b/kernel/padata.c index 97f51e0c1776..de90af5fcbe6 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -390,13 +390,16 @@ void padata_do_serial(struct padata_priv *padata) int hashed_cpu = padata_cpu_hash(pd, padata->seq_nr); struct padata_list *reorder = per_cpu_ptr(pd->reorder_list, hashed_cpu); struct padata_priv *cur; + struct list_head *pos; spin_lock(&reorder->lock); /* Sort in ascending order of sequence number. */ - list_for_each_entry_reverse(cur, &reorder->list, list) + list_for_each_prev(pos, &reorder->list) { + cur = list_entry(pos, struct padata_priv, list); if (cur->seq_nr < padata->seq_nr) break; - list_add(&padata->list, &cur->list); + } + list_add(&padata->list, pos); spin_unlock(&reorder->lock); /* |