Author: markj
Date: Mon May 11 15:17:57 2020
New Revision: 360895
URL: https://svnweb.freebsd.org/changeset/base/360895
Log:
MFC r360378:
Avoid returning POLLIN if the pipe descriptor is not open for reading.
Modified:
stable/12/sys/kern/sys_pipe.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/kern/sys_pipe.c
==============================================================================
--- stable/12/sys/kern/sys_pipe.c Mon May 11 08:40:33 2020
(r360894)
+++ stable/12/sys/kern/sys_pipe.c Mon May 11 15:17:57 2020
(r360895)
@@ -1432,7 +1432,8 @@ pipe_poll(struct file *fp, int events, struct ucred *a
if ((events & POLLINIGNEOF) == 0) {
if (rpipe->pipe_state & PIPE_EOF) {
- revents |= (events & (POLLIN | POLLRDNORM));
+ if (fp->f_flag & FREAD)
+ revents |= (events & (POLLIN | POLLRDNORM));
if (wpipe->pipe_present != PIPE_ACTIVE ||
(wpipe->pipe_state & PIPE_EOF))
revents |= POLLHUP;
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