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| author | Jason Baron <jbaron@redhat.com> | 2012-04-25 16:01:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-25 21:26:33 -0700 |
| commit | 13d518074a952d33d47c428419693f63389547e9 (patch) | |
| tree | 75ccd438b6579840f51b96eed7a5e760e6caf2eb /fs/eventpoll.c | |
| parent | b1c12cbcd0a02527c180a862e8971e249d3b347d (diff) | |
| download | lwn-13d518074a952d33d47c428419693f63389547e9.tar.gz lwn-13d518074a952d33d47c428419693f63389547e9.zip | |
epoll: clear the tfile_check_list on -ELOOP
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 <jbaron@redhat.com>
Reported-by: Yurij M. Plotnikov <Yurij.Plotnikov@oktetlabs.ru>
Cc: Nelson Elhage <nelhage@nelhage.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Tested-by: Alexandra N. Kossovsky <Alexandra.Kossovsky@oktetlabs.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/eventpoll.c')
| -rw-r--r-- | fs/eventpoll.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 739b0985b398..c0b3c70ee87a 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -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); } |