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| author | Umang Jain <umang.jain@ideasonboard.com> | 2021-08-16 18:33:37 +0530 |
|---|---|---|
| committer | Umang Jain <umang.jain@ideasonboard.com> | 2021-08-16 20:04:11 +0530 |
| commit | 5420e359f2416f6d290eea626dddb3a881dd900c (patch) | |
| tree | 2f0713233adad300f16e096cea299041ef59c7c4 /Documentation/sensor_driver_requirements.rst | |
| parent | c2437e8cdefc7ae7efbfbd8662d822a02133084d (diff) | |
pipeline: vimc: Force complete of request on cancelled buffers
When the stream is stopped, the V4L2VideoDevice sends back all
the queued buffers with FrameMetadata::FrameCancelled status.
It is the responsibility of the pipeline handler to handle
these buffers with FrameMetadata::FrameCancelled. VIMC is
currently missing this handling path.
As the FrameMetadata::FrameCancelled is set when the stream is
stopped, we can be sure that no more queued and re-use of request
shall happen. Hence, cancel all the requests' buffers force a
complete with completeBuffer().
The issue is caught by the gstreamer_single_stream_test.cpp running
with vimc. During the check with meson built-in option
'-Db_sanitize=address,undefined'
it was observed:
==118003==ERROR: AddressSanitizer: heap-use-after-free on address 0x60e000037108 at pc 0x7f225160c9ac bp 0x7f224a47b620 sp 0x7f224a47b618
READ of size 4 at 0x60e000037108 thread T1
#0 0x7f225160c9ab in libcamera::Request::sequence() const ../include/libcamera/request.h:55
#1 0x7f22518297aa in libcamera::VimcCameraData::bufferReady(libcamera::FrameBuffer*) ../src/libcamera/pipeline/vimc/vimc.cpp:577
#2 0x7f225183b1ef in libcamera::BoundMethodMember<libcamera::VimcCameraData, void, libcamera::FrameBuffer*>::activate(libcamera::FrameBuffer*, bool) ../include/libcamera/base/bound_method.h:194
#3 0x7f22515cc91f in libcamera::Signal<libcamera::FrameBuffer*>::emit(libcamera::FrameBuffer*) ../include/libcamera/base/signal.h:126
#4 0x7f22515c3305 in libcamera::V4L2VideoDevice::streamOff() ../src/libcamera/v4l2_videodevice.cpp:1605
#5 0x7f225181f345 in libcamera::PipelineHandlerVimc::stop(libcamera::Camera*) ../src/libcamera/pipeline/vimc/vimc.cpp:365
The VimcCameraData::bufferReady seems to emit even after the stream
is stopped. It's primarily due to vimc's lack of handling
FrameMetadata::FrameCancelled in its pipeline handler.
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'Documentation/sensor_driver_requirements.rst')
0 files changed, 0 insertions, 0 deletions