md/raid10: fix wrong setting of max_corr_read_errors

[ Upstream commit f8b20a405428803bd9881881d8242c9d72c6b2b2 ]

There is no input check when echo md/max_read_errors and overflow might
occur. Add check of input number.

Fixes: 1e50915fe0bb ("raid: improve MD/raid10 handling of correctable read errors.")
Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230522072535.1523740-3-linan666@huaweicloud.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 0c97531d35038c525d7cf33ff1b6a54733501b57..829e1bd9bcbf9920a24d517c1e115a68afb7522c 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4513,6 +4513,8 @@ max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len
        rv = kstrtouint(buf, 10, &n);
        if (rv < 0)
                return rv;
+       if (n > INT_MAX)
+               return -EINVAL;
        atomic_set(&mddev->max_corr_read_errors, n);
        return len;
 }