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media: videobuf2: improve max_num_buffers sanity checks

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Ensure that drivers set max_num_buffers to a value >= 32.
For now there is no reason for drivers to request a lower
limit and doing so might potentially cause userspace issues.
Note that the old check of > MAX_BUFFER_INDEX was pointless
since q->max_num_buffers was already limited to MAX_BUFFER_INDEX
or less.

Also add a sanity check in __vb2_init_fileio(), returning
-ENOSPC if a driver returns more than 32 buffers from
VIDIOC_REQBUFS with count = q->min_reqbufs_allocation.

The vb2_fileio_data struct only supports up to 32 buffers,
so we need a check there.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Hans Verkuil 2024-03-18 15:29:33 +01:00
parent e85bfd15c8
commit 1df7b8cd3a
1 changed files with 7 additions and 1 deletions
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8
drivers/media/common/videobuf2/videobuf2-core.c
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@ -2584,7 +2584,7 @@ int vb2_core_queue_init(struct vb2_queue *q)
WARN_ON(!q->ops->buf_queue))
return -EINVAL;
if (WARN_ON(q->max_num_buffers > MAX_BUFFER_INDEX) ||
if (WARN_ON(q->max_num_buffers < VB2_MAX_FRAME) ||
WARN_ON(q->min_queued_buffers > q->max_num_buffers))
return -EINVAL;
@ -2855,6 +2855,12 @@ static int __vb2_init_fileio(struct vb2_queue *q, int read)
ret = vb2_core_reqbufs(q, fileio->memory, 0, &fileio->count);
if (ret)
goto err_kfree;
/* vb2_fileio_data supports max VB2_MAX_FRAME buffers */
if (fileio->count > VB2_MAX_FRAME) {
dprintk(q, 1, "fileio: more than VB2_MAX_FRAME buffers requested\n");
ret = -ENOSPC;
goto err_reqbufs;
}
/*
* Userspace can never add or delete buffers later, so there