ipmi: ipmb: validate write message length

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ipmb_write() read message fields before validating the length byte.

A zero or short write can read uninitialized stack bytes.

A length smaller than the SMBus header underflows the block write length.

Require a non-empty buffer and the minimum IPMB request length.

Also require the length byte plus payload before parsing the message.

Fixes: 51bd6f2915 ("Add support for IPMB driver")
Cc: stable@vger.kernel.org
Signed-off-by: Yousef Alhouseen <alhouseenyousef@gmail.com>
Message-ID: <20260624175353.8592-1-alhouseenyousef@gmail.com>
Signed-off-by: Corey Minyard <corey@minyard.net>

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Yousef Alhouseen 2026-06-24 19:53:53 +02:00 • committed by Corey Minyard

parent 4edcdefd40

commit 5363750688

1 changed files with 3 additions and 2 deletions

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drivers/char/ipmi/ipmb_dev_int.c

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