Merge branch 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull epoll fixes from Al Viro: "Fix reference counting and clean up exit paths" * 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: do_epoll_ctl(): clean the failure exits up a bit epoll: Keep a reference on files added to the check list
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commit
f320ac6e13
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@ -1994,11 +1994,13 @@ static int ep_loop_check_proc(void *priv, void *cookie, int call_nests)
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* not already there, and calling reverse_path_check()
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* during ep_insert().
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*/
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if (list_empty(&epi->ffd.file->f_tfile_llink))
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if (list_empty(&epi->ffd.file->f_tfile_llink)) {
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get_file(epi->ffd.file);
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list_add(&epi->ffd.file->f_tfile_llink,
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&tfile_check_list);
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}
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}
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}
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mutex_unlock(&ep->mtx);
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return error;
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@ -2040,6 +2042,7 @@ static void clear_tfile_check_list(void)
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file = list_first_entry(&tfile_check_list, struct file,
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f_tfile_llink);
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list_del_init(&file->f_tfile_llink);
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fput(file);
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}
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INIT_LIST_HEAD(&tfile_check_list);
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}
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@ -2200,25 +2203,22 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds,
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full_check = 1;
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if (is_file_epoll(tf.file)) {
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error = -ELOOP;
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if (ep_loop_check(ep, tf.file) != 0) {
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clear_tfile_check_list();
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if (ep_loop_check(ep, tf.file) != 0)
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goto error_tgt_fput;
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}
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} else
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} else {
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get_file(tf.file);
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list_add(&tf.file->f_tfile_llink,
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&tfile_check_list);
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error = epoll_mutex_lock(&ep->mtx, 0, nonblock);
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if (error) {
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out_del:
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list_del(&tf.file->f_tfile_llink);
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goto error_tgt_fput;
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}
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error = epoll_mutex_lock(&ep->mtx, 0, nonblock);
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if (error)
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goto error_tgt_fput;
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if (is_file_epoll(tf.file)) {
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tep = tf.file->private_data;
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error = epoll_mutex_lock(&tep->mtx, 1, nonblock);
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if (error) {
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mutex_unlock(&ep->mtx);
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goto out_del;
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goto error_tgt_fput;
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}
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}
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}
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@ -2239,8 +2239,6 @@ out_del:
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error = ep_insert(ep, epds, tf.file, fd, full_check);
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} else
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error = -EEXIST;
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if (full_check)
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clear_tfile_check_list();
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break;
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case EPOLL_CTL_DEL:
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if (epi)
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@ -2263,8 +2261,10 @@ out_del:
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mutex_unlock(&ep->mtx);
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error_tgt_fput:
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if (full_check)
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if (full_check) {
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clear_tfile_check_list();
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mutex_unlock(&epmutex);
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}
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fdput(tf);
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error_fput:
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