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

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[ Upstream commit d5ee8e750c9449e9849a09ce6fb6b8adeaa66adc ]

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>
Stable-dep-of: 7ddc21e317b3 ("padata: Fix refcnt handling in padata_free_shell()")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Xiyu Yang
2021-07-20 11:05:11 -04:00
committed by Greg Kroah-Hartman
parent 2de16f6169
commit 7606807bd6
2 changed files with 6 additions and 5 deletions
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3
include/linux/padata.h
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@@ -12,6 +12,7 @@
#ifndef PADATA_H
#define PADATA_H
#include <linux/refcount.h>
#include <linux/compiler_types.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
@@ -96,7 +97,7 @@ struct parallel_data {
struct padata_shell *ps;
struct padata_list __percpu *reorder_list;
struct padata_serial_queue __percpu *squeue;
atomic_t refcnt;
refcount_t refcnt;
unsigned int seq_nr;
unsigned int processed;
int cpu;