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md/raid5: cap worker count 

static checker reports a potential integer overflow. Cap the worker count to
avoid the overflow.

Reported:-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Shaohua Li 2017-09-21 11:03:52 -07:00
parent c4d6a1b8e8
commit 7d5d7b5058
1 changed files with 5 additions and 2 deletions
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7
drivers/md/raid5.c
View File

@ -6575,14 +6575,17 @@ static ssize_t
raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len) raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
{ {
struct r5conf *conf; struct r5conf *conf;
unsigned long new; unsigned int new;
int err; int err;
struct r5worker_group *new_groups, *old_groups; struct r5worker_group *new_groups, *old_groups;
int group_cnt, worker_cnt_per_group; int group_cnt, worker_cnt_per_group;
if (len >= PAGE_SIZE) if (len >= PAGE_SIZE)
return -EINVAL; return -EINVAL;
if (kstrtoul(page, 10, &new)) if (kstrtouint(page, 10, &new))
return -EINVAL;
/* 8192 should be big enough */
if (new > 8192)
return -EINVAL; return -EINVAL;
err = mddev_lock(mddev); err = mddev_lock(mddev);