misc: ibmvmc: reject oversized inbound messages

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ibmvmc_recv_msg() trusts the message length from the CRQ.

It passes that length directly to h_copy_rdma().

The destination buffer is only max_mtu bytes.

A larger length can overrun it before userspace reads the message.

Validate the CRQ length before issuing the RDMA copy.

Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com>
Link: https://patch.msgid.link/20260624175139.7981-1-alhouseenyousef@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Yousef Alhouseen 2026-06-24 19:51:39 +02:00 • committed by Greg Kroah-Hartman

parent fd62c1f591

commit 18189e5d84

1 changed files with 7 additions and 0 deletions

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drivers/misc/ibmvmc.c

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