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locks,lockd: fix race in nlmsvc_testlock

Bladeren bron 
posix_test_lock() returns a pointer to a struct file_lock which is unprotected
and can be removed while in use by the caller.  Move the conflicting lock from
the return to a parameter, and copy the conflicting lock.

In most cases the caller ends up putting the copy of the conflicting lock on
the stack.  On i386, sizeof(struct file_lock) appears to be about 100 bytes.
We're assuming that's reasonable.

Signed-off-by: Andy Adamson <andros@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson
2006-03-20 13:44:26 -05:00
gecommit door Trond Myklebust
bovenliggende 2e0af86f61
commit 8dc7c3115b
5 gewijzigde bestanden met toevoegingen van 28 en 27 verwijderingen
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7
fs/nfs/file.c
Bestand weergeven

@@ -392,15 +392,14 @@ out_swapfile:
static int do_getlk(struct file *filp, int cmd, struct file_lock *fl)
{
struct file_lock *cfl;
struct file_lock cfl;
struct inode *inode = filp->f_mapping->host;
int status = 0;
lock_kernel();
/* Try local locking first */
cfl = posix_test_lock(filp, fl);
if (cfl != NULL) {
locks_copy_lock(fl, cfl);
if (posix_test_lock(filp, fl, &cfl)) {
locks_copy_lock(fl, &cfl);
goto out;
}