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authorShaohua Li <shli@fb.com>2017-09-21 11:03:52 -0700
committerShaohua Li <shli@fb.com>2017-09-27 20:08:44 -0700
commit7d5d7b5058fbd638914e42504677141a69f43011 (patch)
tree0291889463a5dbd06ae840cdb9e553f76499fcd1 /drivers/md/raid5.c
parentc4d6a1b8e8ea79c439a4871cba540443c9eb13b9 (diff)
downloadlinux-7d5d7b5058fbd638914e42504677141a69f43011.tar.bz2
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>
Diffstat (limited to 'drivers/md/raid5.c')
-rw-r--r--drivers/md/raid5.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 076409455b60..928e24a07133 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6575,14 +6575,17 @@ static ssize_t
raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
{
struct r5conf *conf;
- unsigned long new;
+ unsigned int new;
int err;
struct r5worker_group *new_groups, *old_groups;
int group_cnt, worker_cnt_per_group;
if (len >= PAGE_SIZE)
return -EINVAL;
- if (kstrtoul(page, 10, &new))
+ if (kstrtouint(page, 10, &new))
+ return -EINVAL;
+ /* 8192 should be big enough */
+ if (new > 8192)
return -EINVAL;
err = mddev_lock(mddev);