* [git:media_tree/master] media: videobuf-core.c: poll_wait needs a non-NULL buf pointer
@ 2019-09-05 9:26 Mauro Carvalho Chehab
0 siblings, 0 replies; only message in thread
From: Mauro Carvalho Chehab @ 2019-09-05 9:26 UTC (permalink / raw)
To: linuxtv-commits; +Cc: Hans Verkuil, stable
This is an automatic generated email to let you know that the following patch were queued:
Subject: media: videobuf-core.c: poll_wait needs a non-NULL buf pointer
Author: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Date: Wed Sep 4 06:04:07 2019 -0300
poll_wait uses &buf->done, but buf is NULL. Move the poll_wait to later
in the function once buf is correctly set and only call it if it is
non-NULL.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: bb436cbeb918 ("media: videobuf: fix epoll() by calling poll_wait first")
Cc: <stable@vger.kernel.org> # for v5.1 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
drivers/media/v4l2-core/videobuf-core.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/drivers/media/v4l2-core/videobuf-core.c b/drivers/media/v4l2-core/videobuf-core.c
index 7ef3e4d22bf6..939fc11cf080 100644
--- a/drivers/media/v4l2-core/videobuf-core.c
+++ b/drivers/media/v4l2-core/videobuf-core.c
@@ -1123,7 +1123,6 @@ __poll_t videobuf_poll_stream(struct file *file,
struct videobuf_buffer *buf = NULL;
__poll_t rc = 0;
- poll_wait(file, &buf->done, wait);
videobuf_queue_lock(q);
if (q->streaming) {
if (!list_empty(&q->stream))
@@ -1143,7 +1142,9 @@ __poll_t videobuf_poll_stream(struct file *file,
}
buf = q->read_buf;
}
- if (!buf)
+ if (buf)
+ poll_wait(file, &buf->done, wait);
+ else
rc = EPOLLERR;
if (0 == rc) {
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