[SYCL] Fix the check for read-only host pointer during memobj creation#2697
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romanovvlad merged 2 commits intointel:syclfrom Nov 3, 2020
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[SYCL] Fix the check for read-only host pointer during memobj creation#2697romanovvlad merged 2 commits intointel:syclfrom
romanovvlad merged 2 commits intointel:syclfrom
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Previously, whenever a native memory object was created, the original host pointer passed by the user was checked for being read-only, regardless of what host pointer was actually used at that point. This patch fixes the issue by assuming a writeable host pointer unless it's the one provided by the user. As a result, this fixes a double free issue that appeared with the following usage pattern: 1. Create a buffer with a const user pointer 2. Write-access it on host 3. Access it on a non-host device 4. Access it on host This error was caused by the allocation performed at step 2 being treated as read-only and, therefore, used with PI_MEM_FLAGS_HOST_PTR_COPY rather than PI_MEM_FLAGS_HOST_PTR_USE at step 3, while it was assumed otherwise during the release of this allocation. Signed-off-by: Sergey Semenov <sergey.semenov@intel.com>
romanovvlad
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* upstream/sycl: [SYCL] Move tests with dependencies to on-device directory (intel#2732) [SYCL][Test] Remove leftovers for FPGA archives (intel#2735) [SYCL][NFC] Extend ABI tests to cover device code (intel#2725) [SYCL] Fix link to ESIMD tests (intel#2736) Added the SYCL_INTEL_mem_channel_property extension specification (intel#2688) [SYCL] Add support for new FPGA loop attribute nofusion (intel#2715) [SYCL] Remove host-task-dependency test added to llvm-test-suite (intel#2720) [SYCL] Remove warning about SYCL_EXTERNAL with pointers (intel#2722) [SYCL] dot_product support. (intel#2609) [SYCL][PI][L0] Fix a problem with kernels and programs destruction while they can be used (intel#2710) [SYCL] Fix the check for read-only host pointer during memobj creation (intel#2697)
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Previously, whenever a native memory object was created, the original host
pointer passed by the user was checked for being read-only, regardless
of what host pointer was actually used at that point. This patch fixes the
issue by assuming a writeable host pointer unless it's the one provided by
the user.
As a result, this fixes a double free issue that appeared with the
following usage pattern:
This error was caused by the allocation performed at step 2 being
treated as read-only and, therefore, used with
PI_MEM_FLAGS_HOST_PTR_COPY rather than PI_MEM_FLAGS_HOST_PTR_USE at step
3, while it was assumed otherwise during the release of this allocation.
Signed-off-by: Sergey Semenov sergey.semenov@intel.com