Sebastian Alba Vives 16381bda90 fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region() ...

[ Upstream commit fc3b071a7c ]

afu_ioctl_dma_map() accepts a 64-bit length from userspace via
DFL_FPGA_PORT_DMA_MAP ioctl without an upper bound check. The value
is passed to afu_dma_pin_pages() where npages is derived as
length >> PAGE_SHIFT and passed to pin_user_pages_fast() which takes
int nr_pages, causing implicit truncation if length is very large.

Validate map.length at the ioctl entry point before calling
afu_dma_map_region(), rejecting values whose page count exceeds
INT_MAX.

Fixes: fa8dda1ede ("fpga: dfl: afu: add DFL_FPGA_PORT_DMA_MAP/UNMAP ioctls support")
Cc: stable@vger.kernel.org
Signed-off-by: Sebastian Alba Vives <sebasjosue84@gmail.com>
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20260518190742.61426-3-sebasjosue84@gmail.com
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2026-08-03 11:15:33 +02:00

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tests

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altera-cvp.c

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altera-fpga2sdram.c

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altera-freeze-bridge.c

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altera-hps2fpga.c

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altera-pr-ip-core-plat.c

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altera-pr-ip-core.c

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altera-ps-spi.c

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dfl-afu-dma-region.c

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dfl-afu-error.c

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dfl-afu-main.c

fpga: dfl-afu: validate DMA mapping length in afu_dma_map_region()

2026-08-03 11:15:33 +02:00

dfl-afu-region.c

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dfl-afu.h

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dfl-fme-br.c

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dfl-fme-error.c

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dfl-fme-main.c

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dfl-fme-mgr.c

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dfl-fme-perf.c

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dfl-fme-pr.c

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dfl-fme-pr.h

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dfl-fme-region.c

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dfl-fme.h

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dfl-n3000-nios.c

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dfl-pci.c

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dfl.c

fpga: dfl: add bounds check in dfh_get_param_size()

2026-07-24 16:03:37 +02:00

dfl.h

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fpga-bridge.c

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fpga-mgr.c

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fpga-region.c

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ice40-spi.c

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intel-m10-bmc-sec-update.c

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Kconfig

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lattice-sysconfig-spi.c

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lattice-sysconfig.c

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lattice-sysconfig.h

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machxo2-spi.c

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Makefile

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microchip-spi.c

fpga: microchip-spi: fix zero header_size OOB read in mpf_ops_parse_header()

2026-07-24 16:03:37 +02:00

of-fpga-region.c

fpga: region: fix use-after-free in child_regions_with_firmware()

2026-07-04 13:42:26 +02:00

socfpga-a10.c

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socfpga.c

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stratix10-soc.c

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ts73xx-fpga.c

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versal-fpga.c

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xilinx-pr-decoupler.c

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xilinx-spi.c

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zynq-fpga.c

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zynqmp-fpga.c

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