cxl/test: Verify cmd->size_in before accessing payload

Several mock mailbox handlers access input payload fields before
verifying that cmd->size_in is large enough for the corresponding
structure.

To ensure invalid commands are rejected before any payload data is
consumed, add missing size checks and move existing checks ahead of
the first payload field access.

[dj: Updated commit log per Alison's comments. ]

Fixes: 7d3eb23c4ccf ("tools/testing/cxl: Introduce a mock memory device + driver")
Fixes: d1dca858f058 ("cxl/test: Add generic mock events")
Fixes: f6448cb5f2f3 ("tools/testing/cxl: add firmware update emulation to CXL memdevs")
Fixes: e77e9c107978 ("cxl/test: Add Get Feature support to cxl_test")
Link: https://lore.kernel.org/linux-cxl/20260605143748.235271F00893@smtp.kernel.org/
Suggested-by: sashiko-bot
Tested-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

0 files changed, 0 insertions, 0 deletions