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

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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>
This commit is contained in:
Chengen Du 2025-01-14 12:12:34 +08:00 committed by Konrad Rzeszutek Wilk
parent e1e17a1715
commit 07e0d99a2f
1 changed files with 4 additions and 1 deletions
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5
drivers/firmware/iscsi_ibft.c
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@ -310,7 +310,10 @@ static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)
str += sprintf_ipaddr(str, nic->ip_addr);
break;
case ISCSI_BOOT_ETH_SUBNET_MASK:
val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
if (nic->subnet_mask_prefix > 32)
val = cpu_to_be32(~0);
else
val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
str += sprintf(str, "%pI4", &val);
break;
case ISCSI_BOOT_ETH_PREFIX_LEN: