linux-kernel - UBSAN: array-index-out-of-bounds in megaraid_sas

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Date:   Tue, 29 Mar 2022 16:18:07 +0200
From:   Andrea Gelmini <andrea.gelmini@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     yang.lee@...ux.alibaba.com, bvanassche@....org, nitesh@...hat.com,
        martin.petersen@...cle.com, sumit.saxena@...adcom.com,
        jing.yangyang@....com.cn, colin.king@...el.com
Subject: UBSAN: array-index-out-of-bounds in megaraid_sas_fp.c (5.15.0 and 5.17.1)

Hi everybody,
   we use 12th, 13th and 14th generation Dell servers, Poweredge:
R720dx, R730dx and 740xd.

   The disk controllers are PERC: H710P, H730 mini, H730P.

   We are using Ubuntu 22.04 on these, without troubles, but at boot
we have a lot of these kind of complains, both with stock kernel of
the distro and 5.17.1 (precompiled downloaded from kernel.ubuntu.com).
So, it works, but I guess it's relevant for developers to see this:

dmesg.txt:[    2.241835] UBSAN: array-index-out-of-bounds in
/build/linux-CNGQTa/linux-5.15.0/drivers/scsi/megaraid/megaraid_sas_fp.c:103:32
dmesg.txt:[    2.252462] UBSAN: array-index-out-of-bounds in
/build/linux-CNGQTa/linux-5.15.0/drivers/scsi/megaraid/megaraid_sas_fp.c:103:32
dmesg.txt:[    2.317949]  ubsan_epilogue+0x9/0x45
dmesg.txt:[    2.317952]  __ubsan_handle_out_of_bounds.cold+0x44/0x49
dmesg.txt:[    2.339813] UBSAN: array-index-out-of-bounds in
/build/linux-CNGQTa/linux-5.15.0/drivers/scsi/megaraid/megaraid_sas_fp.c:115:31
dmesg.txt:[    2.361435]  ubsan_epilogue+0x9/0x45
dmesg.txt:[    2.361437]  __ubsan_handle_out_of_bounds.cold+0x44/0x49
dmesg.txt:[    2.394157] UBSAN: array-index-out-of-bounds in
/build/linux-CNGQTa/linux-5.15.0/drivers/scsi/megaraid/megaraid_sas_fp.c:125:9

   You can find all files related to these machines (dmesg, dmidecode,
and so on) organized by kernel, installation or liveCD, here:

    http://mail.gelma.net/PERC

Thanks a lot for your work,
Gelma