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epoll: clear the tfile_check_list on -ELOOP

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An epoll_ctl(,EPOLL_CTL_ADD,,) operation can return '-ELOOP' to prevent
circular epoll dependencies from being created.  However, in that case we
do not properly clear the 'tfile_check_list'.  Thus, add a call to
clear_tfile_check_list() for the -ELOOP case.

Signed-off-by: Jason Baron <[email protected]>
Reported-by: Yurij M. Plotnikov <[email protected]>
Cc: Nelson Elhage <[email protected]>
Cc: Davide Libenzi <[email protected]>
Tested-by: Alexandra N. Kossovsky <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jason Baron 2012-04-25 16:01:47 -07:00 • committed by Linus Torvalds
commit 13d518074a
1 changed files with 3 additions and 1 deletions
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4
fs/eventpoll.c
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@ -1663,8 +1663,10 @@ SYSCALL_DEFINE4(epoll_ctl, int, epfd, int, op, int, fd,
if (op == EPOLL_CTL_ADD) {
if (is_file_epoll(tfile)) {
error = -ELOOP;
if (ep_loop_check(ep, tfile) != 0)
if (ep_loop_check(ep, tfile) != 0) {
clear_tfile_check_list();
goto error_tgt_fput;
}
} else
list_add(&tfile->f_tfile_llink, &tfile_check_list);
}