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| author | Yu Kuai <yukuai3@huawei.com> | 2023-10-10 23:19:40 +0800 |
|---|---|---|
| committer | Song Liu <song@kernel.org> | 2023-10-10 18:49:49 -0700 |
| commit | 617787f1386da5e851dad68926a31522134d352b (patch) | |
| tree | 51f926ec5ca0fa5cae444390d5c5ffe47938ea63 /drivers/md | |
| parent | 9e55a22fce1384837c213274d1a3b93be16ed9d7 (diff) | |
| download | linux-617787f1386da5e851dad68926a31522134d352b.tar.gz linux-617787f1386da5e851dad68926a31522134d352b.tar.bz2 linux-617787f1386da5e851dad68926a31522134d352b.zip | |
md: use READ_ONCE/WRITE_ONCE for 'suspend_lo' and 'suspend_hi'
Protect 'suspend_lo' and 'suspend_hi' with READ_ONCE/WRITE_ONCE to prevent
reading abnormal values.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20231010151958.145896-2-yukuai1@huaweicloud.com
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/md.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 78853b05f99c..930bcabeec79 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -359,11 +359,11 @@ static bool is_suspended(struct mddev *mddev, struct bio *bio) return true; if (bio_data_dir(bio) != WRITE) return false; - if (mddev->suspend_lo >= mddev->suspend_hi) + if (READ_ONCE(mddev->suspend_lo) >= READ_ONCE(mddev->suspend_hi)) return false; - if (bio->bi_iter.bi_sector >= mddev->suspend_hi) + if (bio->bi_iter.bi_sector >= READ_ONCE(mddev->suspend_hi)) return false; - if (bio_end_sector(bio) < mddev->suspend_lo) + if (bio_end_sector(bio) < READ_ONCE(mddev->suspend_lo)) return false; return true; } @@ -5179,7 +5179,8 @@ __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); static ssize_t suspend_lo_show(struct mddev *mddev, char *page) { - return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); + return sprintf(page, "%llu\n", + (unsigned long long)READ_ONCE(mddev->suspend_lo)); } static ssize_t @@ -5199,7 +5200,7 @@ suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) return err; mddev_suspend(mddev); - mddev->suspend_lo = new; + WRITE_ONCE(mddev->suspend_lo, new); mddev_resume(mddev); mddev_unlock(mddev); @@ -5211,7 +5212,8 @@ __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); static ssize_t suspend_hi_show(struct mddev *mddev, char *page) { - return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); + return sprintf(page, "%llu\n", + (unsigned long long)READ_ONCE(mddev->suspend_hi)); } static ssize_t @@ -5231,7 +5233,7 @@ suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) return err; mddev_suspend(mddev); - mddev->suspend_hi = new; + WRITE_ONCE(mddev->suspend_hi, new); mddev_resume(mddev); mddev_unlock(mddev); |