thunderbolt: Clamp XDomain response data copy to allocation size

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tb_xdp_properties_request() derives the per-packet copy length from
the response header without checking that it fits in the previously
allocated data buffer.  A malicious peer can set its length field
larger than the declared data_length, causing memcpy to write past
the kcalloc allocation.

Clamp the per-packet copy length so that the cumulative offset
never exceeds data_len.

Fixes: cdae7c07e3 ("thunderbolt: Add support for XDomain properties")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4-7
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

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Michael Bommarito 2026-05-25 05:28:27 -04:00 • committed by Mika Westerberg

parent 65423079c7

commit 322e93448d

1 changed files with 2 additions and 0 deletions

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drivers/thunderbolt/xdomain.c

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