The v4l2_compat_get_array_args() function can leave uninitialized memory in the
buffer it is passed. So zero it before copying array elements from userspace
into the buffer.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Reported-by: syzbot+ff18193ff05f3f87f226@xxxxxxxxxxxxxxxxxxxxxxxxx
---
diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index 0f3d6b5667b0..55c26e7d370e 100644
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -1040,6 +1040,8 @@ int v4l2_compat_get_array_args(struct file *file, void *mbuf,
{
int err = 0;
+ memset(mbuf, 0, array_size);
+
switch (cmd) {
case VIDIOC_G_FMT32:
case VIDIOC_S_FMT32:
