Block: Fix block/elevator.c elevator_get() off-by-one error
elevator_get() not check the name length, if the name length > sizeof(elv), elv will miss the '\0'. And elv buffer will be replace "-iosched" as something like aaaaaaaaa, then call request_module() can load an not trust module. Signed-off-by: Zhitong Wang <zhitong.wangzt@alibaba-inc.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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@ -154,7 +154,7 @@ static struct elevator_type *elevator_get(const char *name)
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spin_unlock(&elv_list_lock);
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sprintf(elv, "%s-iosched", name);
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snprintf(elv, sizeof(elv), "%s-iosched", name);
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request_module("%s", elv);
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spin_lock(&elv_list_lock);
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