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Limit v4l2_loopback_write calls to (streaming) writers #477

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Jun 19, 2022
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Limit v4l2_loopback_write calls to (streaming) writers #477

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6 changes: 4 additions & 2 deletions v4l2loopback.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2087,15 +2087,17 @@ static ssize_t v4l2_loopback_read(struct file *file, char __user *buf,
static ssize_t v4l2_loopback_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct v4l2_loopback_opener *opener;
struct v4l2_loopback_device *dev;
int write_index;
struct v4l2_buffer *b;
MARK();

dev = v4l2loopback_getdevice(file);
opener = fh_to_opener(file->private_data);

/* there's at least one writer, so don't stop announcing output capabilities */
dev->ready_for_output = 0;
if (WRITER != opener->type)
return -EINVAL;

if (!dev->ready_for_capture) {
int ret = allocate_buffers(dev);
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