ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 04:33:26 +02:00
Code Issues Packages Projects Releases Wiki Activity

padata: Convert from atomic_t to refcount_t on parallel_data->refcnt

Browse Source 
refcount_t type and corresponding API can protect refcounters from
accidental underflow and overflow and further use-after-free situations.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Acked-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Xiyu Yang
2021-07-20 11:05:11 -04:00
committed by Herbert Xu
parent 192b722f38
commit d5ee8e750c
2 changed files with 6 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
kernel/padata.c
View File

@@ -211,7 +211,7 @@ int padata_do_parallel(struct padata_shell *ps,
if ((pinst->flags & PADATA_RESET))
goto out;
atomic_inc(&pd->refcnt);
refcount_inc(&pd->refcnt);
padata->pd = pd;
padata->cb_cpu = *cb_cpu;
@@ -383,7 +383,7 @@ static void padata_serial_worker(struct work_struct *serial_work)
}
local_bh_enable();
if (atomic_sub_and_test(cnt, &pd->refcnt))
if (refcount_sub_and_test(cnt, &pd->refcnt))
padata_free_pd(pd);
}
@@ -593,7 +593,7 @@ static struct parallel_data *padata_alloc_pd(struct padata_shell *ps)
padata_init_reorder_list(pd);
padata_init_squeues(pd);
pd->seq_nr = -1;
atomic_set(&pd->refcnt, 1);
refcount_set(&pd->refcnt, 1);
spin_lock_init(&pd->lock);
pd->cpu = cpumask_first(pd->cpumask.pcpu);
INIT_WORK(&pd->reorder_work, invoke_padata_reorder);
@@ -667,7 +667,7 @@ static int padata_replace(struct padata_instance *pinst)
synchronize_rcu();
list_for_each_entry_continue_reverse(ps, &pinst->pslist, list)
if (atomic_dec_and_test(&ps->opd->refcnt))
if (refcount_dec_and_test(&ps->opd->refcnt))
padata_free_pd(ps->opd);
pinst->flags &= ~PADATA_RESET;