| Message ID | 157186191654.3995.6474781916564747415.stgit@warthog.procyon.org.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | pipe: Notification queue preparation [ver #2] | expand |
diff --git a/fs/pipe.c b/fs/pipe.c index 3df93990dd9d..6a982a88f658 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -462,6 +462,11 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from) spin_lock_irq(&pipe->wait.lock); head = pipe->head; + if (pipe_full(head, pipe->tail, max_usage)) { + spin_unlock_irq(&pipe->wait.lock); + continue; + } + pipe_commit_write(pipe, head + 1); /* Always wake up, even if the copy fails. Otherwise
Make pipe_write() check to see if the ring has become full between it taking the pipe mutex, checking the ring status and then taking the spinlock. This can happen if a notification is written into the pipe as that happens without the pipe mutex. Signed-off-by: David Howells <dhowells@redhat.com> --- fs/pipe.c | 5 +++++ 1 file changed, 5 insertions(+)