uid_cputime: Check for the range while removing range of UIDs.

Checking if the uid_entry->uid matches the uid intended to be removed will
prevent deleting unwanted uid_entry.
Type cast the key for the hashtable to the same size, as when they were
inserted. This will make sure that we can find the uid_entry we want.

Bug: 25195548
Change-Id: I80f8c66c4e3054cafad2a2b1381b0e1ea58f39fc
Signed-off: Ruchi kandoi <kandoiruchi@google.com>

drivers/misc/uid_cputime.c

@@ -172,16 +172,17 @@ static ssize_t uid_remove_write(struct file *file,
 		kstrtol(end_uid, 10, &uid_end) != 0) {
 		return -EINVAL;
 	}
-
 	mutex_lock(&uid_lock);
 
 	for (; uid_start <= uid_end; uid_start++) {
 		hash_for_each_possible_safe(hash_table, uid_entry, tmp,
-							hash, uid_start) {
+							hash, (uid_t)uid_start) {
+			if(uid_start == uid_entry->uid) {
 				hash_del(&uid_entry->hash);
 				kfree(uid_entry);
 			}
 		}
+	}
 
 	mutex_unlock(&uid_lock);
 	return count;