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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>
This commit is contained in:
wzt.wzt@gmail.com 2010-04-02 08:41:14 +02:00 committed by Jens Axboe
parent b2b163dd47
commit a506aedc51
1 changed files with 1 additions and 1 deletions
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2
block/elevator.c
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@ -154,7 +154,7 @@ static struct elevator_type *elevator_get(const char *name)
spin_unlock(&elv_list_lock); spin_unlock(&elv_list_lock);
sprintf(elv, "%s-iosched", name); snprintf(elv, sizeof(elv), "%s-iosched", name);
request_module("%s", elv); request_module("%s", elv);
spin_lock(&elv_list_lock); spin_lock(&elv_list_lock);