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lockd: set other missing fields when unlocking files 

[ Upstream commit 18ebd35b61 ]

vfs_lock_file() expects the struct file_lock to be fully initialised by
the caller. Re-exported NFSv3 has been seen to Oops if the fl_file field
is NULL.

Fixes: aec158242b ("lockd: set fl_owner when unlocking files")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216582
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2022-11-06 14:02:39 -05:00 committed by Greg Kroah-Hartman
parent 5c8e13a2b6
commit d7aa9f7778
1 changed files with 10 additions and 7 deletions
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17
fs/lockd/svcsubs.c
View File

@ -176,7 +176,7 @@ nlm_delete_file(struct nlm_file *file)
}
}
static int nlm_unlock_files(struct nlm_file *file, fl_owner_t owner)
static int nlm_unlock_files(struct nlm_file *file, const struct file_lock *fl)
{
struct file_lock lock;
@ -184,12 +184,15 @@ static int nlm_unlock_files(struct nlm_file *file, fl_owner_t owner)
lock.fl_type = F_UNLCK;
lock.fl_start = 0;
lock.fl_end = OFFSET_MAX;
lock.fl_owner = owner;
if (file->f_file[O_RDONLY] &&
vfs_lock_file(file->f_file[O_RDONLY], F_SETLK, &lock, NULL))
lock.fl_owner = fl->fl_owner;
lock.fl_pid = fl->fl_pid;
lock.fl_flags = FL_POSIX;
lock.fl_file = file->f_file[O_RDONLY];
if (lock.fl_file && vfs_lock_file(lock.fl_file, F_SETLK, &lock, NULL))
goto out_err;
if (file->f_file[O_WRONLY] &&
vfs_lock_file(file->f_file[O_WRONLY], F_SETLK, &lock, NULL))
lock.fl_file = file->f_file[O_WRONLY];
if (lock.fl_file && vfs_lock_file(lock.fl_file, F_SETLK, &lock, NULL))
goto out_err;
return 0;
out_err:
@ -226,7 +229,7 @@ again:
if (match(lockhost, host)) {
spin_unlock(&flctx->flc_lock);
if (nlm_unlock_files(file, fl->fl_owner))
if (nlm_unlock_files(file, fl))
return 1;
goto again;
}