fpga: altera-cvp: Avoid out-of-bounds read in trailing byte write

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The trailing byte path in altera_cvp_send_block() dereferences a u32
pointer even when only 1-3 bytes remain in the input buffer. If the buffer
ends at a page or scatterlist boundary, this can read past the valid image
data and fault.

Copy the remaining bytes into a zero-initialized u32 before writing the
final word so only valid bytes are read from the input buffer.

Fixes: 34d1dc17ce ("fpga manager: Add Altera CvP driver")
Cc: stable@vger.kernel.org
Signed-off-by: Daisuke Matsuda <matsuda@preferred.jp>
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20260723081912.74082-1-dskmtsd@gmail.com
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>

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Daisuke Matsuda 2026-07-23 08:19:12 +00:00 • committed by Xu Yilun

parent 2c972f03cc

commit 9da70a43b5

1 changed files with 6 additions and 4 deletions

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drivers/fpga/altera-cvp.c

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