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locks: consolidate checks for compatible filp->f_mode values in setlk handlers

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Move this check into flock64_to_posix_lock instead of duplicating it in
two places. This also fixes a minor wart in the code where we continue
referring to the struct flock after converting it to struct file_lock.

Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Jeff Layton 2014-02-03 12:13:08 -05:00
parent ef12e72a01
commit bce7560d49
1 changed files with 12 additions and 34 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

46
fs/locks.c
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@ -388,6 +388,18 @@ static int flock64_to_posix_lock(struct file *filp, struct file_lock *fl,
fl->fl_ops = NULL;
fl->fl_lmops = NULL;
/* Ensure that fl->fl_filp has compatible f_mode */
switch (l->l_type) {
case F_RDLCK:
if (!(filp->f_mode & FMODE_READ))
return -EBADF;
break;
case F_WRLCK:
if (!(filp->f_mode & FMODE_WRITE))
return -EBADF;
break;
}
return assign_type(fl, l->l_type);
}
@ -2025,23 +2037,6 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
file_lock->fl_flags |= FL_SLEEP;
}
error = -EBADF;
switch (flock.l_type) {
case F_RDLCK:
if (!(filp->f_mode & FMODE_READ))
goto out;
break;
case F_WRLCK:
if (!(filp->f_mode & FMODE_WRITE))
goto out;
break;
case F_UNLCK:
break;
default:
error = -EINVAL;
goto out;
}
error = do_lock_file_wait(filp, cmd, file_lock);
/*
@ -2143,23 +2138,6 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
file_lock->fl_flags |= FL_SLEEP;
}
error = -EBADF;
switch (flock.l_type) {
case F_RDLCK:
if (!(filp->f_mode & FMODE_READ))
goto out;
break;
case F_WRLCK:
if (!(filp->f_mode & FMODE_WRITE))
goto out;
break;
case F_UNLCK:
break;
default:
error = -EINVAL;
goto out;
}
error = do_lock_file_wait(filp, cmd, file_lock);
/*