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| author |   Chengen Du <chengen.du@canonical.com> | 2025-01-14 12:12:34 +0800 |
|---|---|---|
| committer |   Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2025-01-29 14:58:31 -0500 |
| commit | 07e0d99a2f701123ad3104c0f1a1e66bce74d6e5 (patch) | |
| tree | cdc89427b9b22837828adb61551a4529b8c651af | |
| parent | firmware: iscsi_ibft: fix ISCSI_IBFT Kconfig entry (diff) | |
| download | wireguard-linux-07e0d99a2f701123ad3104c0f1a1e66bce74d6e5.tar.xz wireguard-linux-07e0d99a2f701123ad3104c0f1a1e66bce74d6e5.zip | |
iscsi_ibft: Fix UBSAN shift-out-of-bounds warning in ibft_attr_show_nic()
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>
| -rw-r--r-- | drivers/firmware/iscsi_ibft.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/firmware/iscsi_ibft.c b/drivers/firmware/iscsi_ibft.c index 6e9788324fea..371f24569b3b 100644 --- a/drivers/firmware/iscsi_ibft.c +++ b/drivers/firmware/iscsi_ibft.c @@ -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: |