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Date: Tue, 26 Oct 2021 09:47:40 +0000
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Subject: [dpdk-dev] [Bug 838] [ubsan] bnxt: left shift cannot be represented
in bnxt_hwrm_ver_get()
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https://bugs.dpdk.org/show_bug.cgi?id=3D838
Bug ID: 838
Summary: [ubsan] bnxt: left shift cannot be represented in
bnxt_hwrm_ver_get()
Product: DPDK
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: Normal
Component: ethdev
Assignee: dev@dpdk.org
Reporter: burner-email@caramail.com
Target Milestone: ---
Hello,
An issue found by UBSan:
DPDK/drivers/net/bnxt/bnxt_hwrm.c:X:Y: runtime error: left shift of 216 by =
24
places cannot be represented in type 'int'.
The offending code is in bnxt_hwrm_ver_get():
bp->fw_ver =3D (resp->hwrm_fw_maj_8b << 24) | <--- HERE
(resp->hwrm_fw_min_8b << 16) |
(resp->hwrm_fw_bld_8b << 8) |
resp->hwrm_fw_rsvd_8b;
The left shifts here are of type 'int', and the first one cannot be
represented. This is an undefined behavior.
The first shift should be explicitly cast to uint32_t, ie:
bp->fw_ver =3D ((uint32_t)resp->hwrm_fw_maj_8b << 24) |
(resp->hwrm_fw_min_8b << 16) |
(resp->hwrm_fw_bld_8b << 8) |
resp->hwrm_fw_rsvd_8b;
I have tested this patch, and could confirm with UBSan that there is no
undefined behavior anymore.
Thanks!
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