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authorAndy Adamson <andros@citi.umich.edu>2006-03-20 13:44:26 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-03-20 13:44:26 -0500
commit8dc7c3115b611c00006eac3ee5b108296432aab7 (patch)
treebe44c59907cbdcb6fdf46d0ad9cc140af757acfc /fs/lockd/svclock.c
parent2e0af86f618c697b44e2d67dff151256c58201c4 (diff)
locks,lockd: fix race in nlmsvc_testlock
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>
Diffstat (limited to 'fs/lockd/svclock.c')
-rw-r--r--fs/lockd/svclock.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index f5398097b84b..d683dd022e08 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -376,8 +376,6 @@ u32
nlmsvc_testlock(struct nlm_file *file, struct nlm_lock *lock,
struct nlm_lock *conflock)
{
- struct file_lock *fl;
-
dprintk("lockd: nlmsvc_testlock(%s/%ld, ty=%d, %Ld-%Ld)\n",
file->f_file->f_dentry->d_inode->i_sb->s_id,
file->f_file->f_dentry->d_inode->i_ino,
@@ -385,14 +383,14 @@ nlmsvc_testlock(struct nlm_file *file, struct nlm_lock *lock,
(long long)lock->fl.fl_start,
(long long)lock->fl.fl_end);
- if ((fl = posix_test_lock(file->f_file, &lock->fl)) != NULL) {
+ if (posix_test_lock(file->f_file, &lock->fl, &conflock->fl)) {
dprintk("lockd: conflicting lock(ty=%d, %Ld-%Ld)\n",
- fl->fl_type, (long long)fl->fl_start,
- (long long)fl->fl_end);
+ conflock->fl.fl_type,
+ (long long)conflock->fl.fl_start,
+ (long long)conflock->fl.fl_end);
conflock->caller = "somehost"; /* FIXME */
conflock->oh.len = 0; /* don't return OH info */
- conflock->svid = fl->fl_pid;
- conflock->fl = *fl;
+ conflock->svid = conflock->fl.fl_pid;
return nlm_lck_denied;
}