Hsin-Yi Wang e6599adfad media: mtk-vpu: avoid unaligned access to DTCM buffer. ... Previously, vpu->recv_buf and send_buf are forced cast from void __iomem *tcm. vpu->recv_buf->share_buf is passed to vpu_ipi_desc.handler(). It's not able to do unaligned access. Otherwise kernel would crash due to unable to handle kernel paging request. struct vpu_run { u32 signaled; char fw_ver[VPU_FW_VER_LEN]; unsigned int dec_capability; unsigned int enc_capability; wait_queue_head_t wq; }; fw_ver starts at 4 byte boundary. If system enables CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS, strscpy() will do read_word_at_a_time(), which tries to read 8-byte: *(unsigned long *)addr vpu_init_ipi_handler() calls strscpy(), which would lead to crash. vpu_init_ipi_handler() and several other handlers (eg. vpu_dec_ipi_handler) only do read access to this data, so they can be const, and we can use memcpy_fromio() to copy the buf to another non iomem buffer then pass to handler. Fixes: 85709cbf15 ("media: replace strncpy() by strscpy()") Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>		2020-03-12 16:25:33 +01:00
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Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
mtk_vpu.c	media: mtk-vpu: avoid unaligned access to DTCM buffer.	2020-03-12 16:25:33 +01:00
mtk_vpu.h	media: mtk-vpu: avoid unaligned access to DTCM buffer.	2020-03-12 16:25:33 +01:00