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[PATCH] fs/locks.c: Fix lease_init 

It is insane to be giving lease_init() the task of freeing the lock it is
supposed to initialise, given that the lock is not guaranteed to be
allocated on the stack. This causes lockups in fcntl_setlease().
Problem diagnosed by Daniel Hokka Zakrisson <daniel@hozac.com>

Also fix a slab leak in __setlease() due to an uninitialised return value.
Problem diagnosed by Björn Steinbrink.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Tested-by: Daniel Hokka Zakrisson <daniel@hozac.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Trond Myklebust 2006-05-07 23:02:42 -04:00 committed by Linus Torvalds
parent 9d21f09ca0
commit 75dff55af9
1 changed files with 12 additions and 9 deletions
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21
fs/locks.c
View File

@ -446,15 +446,14 @@ static struct lock_manager_operations lease_manager_ops = {
*/
static int lease_init(struct file *filp, int type, struct file_lock *fl)
{
if (assign_type(fl, type) != 0)
return -EINVAL;
fl->fl_owner = current->files;
fl->fl_pid = current->tgid;
fl->fl_file = filp;
fl->fl_flags = FL_LEASE;
if (assign_type(fl, type) != 0) {
locks_free_lock(fl);
return -EINVAL;
}
fl->fl_start = 0;
fl->fl_end = OFFSET_MAX;
fl->fl_ops = NULL;
@ -466,16 +465,19 @@ static int lease_init(struct file *filp, int type, struct file_lock *fl)
static int lease_alloc(struct file *filp, int type, struct file_lock **flp)
{
struct file_lock *fl = locks_alloc_lock();
int error;
int error = -ENOMEM;
if (fl == NULL)
return -ENOMEM;
goto out;
error = lease_init(filp, type, fl);
if (error)
return error;
if (error) {
locks_free_lock(fl);
fl = NULL;
}
out:
*flp = fl;
return 0;
return error;
}
/* Check if two locks overlap each other.
@ -1372,6 +1374,7 @@ static int __setlease(struct file *filp, long arg, struct file_lock **flp)
goto out;
if (my_before != NULL) {
*flp = *my_before;
error = lease->fl_lmops->fl_change(my_before, arg);
goto out;
}