iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()

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[ Upstream commit 07e0d99a2f ]

When performing an iSCSI boot using IPv6, iscsistart still reads the
/sys/firmware/ibft/ethernetX/subnet-mask entry. Since the IPv6 prefix
length is 64, this causes the shift exponent to become negative,
triggering a UBSAN warning. As the concept of a subnet mask does not
apply to IPv6, the value is set to ~0 to suppress the warning message.

Signed-off-by: Chengen Du <chengen.du@canonical.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Chengen Du 2025-01-14 12:12:34 +08:00 • committed by Greg Kroah-Hartman

parent 4a2ea3dd4e

commit b388e185bf

1 changed files with 4 additions and 1 deletions

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drivers/firmware/iscsi_ibft.c

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