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drivers/ipmi: Handle the condition when (dev->chip_info == NULL) 

Some former commits (e.g. Ieb41771c75aae902191bba5d220796e6c343f8e0)
blindly assume that dev->chip_info is capable to be dereferenced,
making at least compilers complain about potential null pointer
dereference. They might cause crash if truly (dev->chip_info == NULL).

Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Change-Id: I1d694b12f6c42961c104fe839d4ee46c0f111197
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47387
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
This commit is contained in:
Bill XIE 2020-11-10 15:20:24 +08:00 committed by Michael Niewöhner
parent 5caca947b2
commit f880eb061b
1 changed files with 29 additions and 31 deletions
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36
src/drivers/ipmi/ipmi_kcs_ops.c
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@ -76,8 +76,8 @@ static void ipmi_kcs_init(struct device *dev)
{
struct ipmi_devid_rsp rsp;
uint32_t man_id = 0, prod_id = 0;
struct drivers_ipmi_config *conf = NULL;
struct ipmi_selftest_rsp selftestrsp;
struct drivers_ipmi_config *conf = dev->chip_info;
struct ipmi_selftest_rsp selftestrsp = {0};
uint8_t retry_count;
if (!dev->enabled)
@ -85,11 +85,13 @@ static void ipmi_kcs_init(struct device *dev)
printk(BIOS_DEBUG, "IPMI: PNP KCS 0x%x\n", dev->path.pnp.port);
if (dev->chip_info)
conf = dev->chip_info;
if (!conf) {
printk(BIOS_WARNING, "IPMI: chip_info is missing! Skip init.\n");
return;
}
/* Get IPMI version for ACPI and SMBIOS */
if (conf && conf->wait_for_bmc && conf->bmc_boot_timeout) {
if (conf->wait_for_bmc && conf->bmc_boot_timeout) {
struct stopwatch sw;
stopwatch_init_msecs_expire(&sw, conf->bmc_boot_timeout * 1000);
printk(BIOS_INFO, "IPMI: Waiting for BMC...\n");
@ -174,7 +176,7 @@ static unsigned long
ipmi_write_acpi_tables(const struct device *dev, unsigned long current,
struct acpi_rsdp *rsdp)
{
struct drivers_ipmi_config *conf = NULL;
struct drivers_ipmi_config *conf = dev->chip_info;
struct acpi_spmi *spmi;
s8 gpe_interrupt = -1;
u32 apic_interrupt = 0;
@ -204,15 +206,11 @@ ipmi_write_acpi_tables(const struct device *dev, unsigned long current,
printk(BIOS_DEBUG, "ACPI: * SPMI at %lx\n", current);
spmi = (struct acpi_spmi *)current;
if (dev->chip_info)
conf = dev->chip_info;
if (conf) {
if (conf->have_gpe)
gpe_interrupt = conf->gpe_interrupt;
if (conf->have_apic)
apic_interrupt = conf->apic_interrupt;
}
/* Use command to get UID from ipmi_ssdt */
acpi_create_ipmi(dev, spmi, (ipmi_revision_major << 8) |
@ -223,6 +221,9 @@ ipmi_write_acpi_tables(const struct device *dev, unsigned long current,
acpi_add_table(rsdp, spmi);
current += spmi->header.length;
} else {
printk(BIOS_WARNING, "IPMI: chip_info is missing!\n");
}
return current;
}
@ -230,7 +231,7 @@ ipmi_write_acpi_tables(const struct device *dev, unsigned long current,
static void ipmi_ssdt(const struct device *dev)
{
const char *scope = acpi_device_scope(dev);
struct drivers_ipmi_config *conf = NULL;
struct drivers_ipmi_config *conf = dev->chip_info;
if (!scope) {
printk(BIOS_ERR, "IPMI: Missing ACPI scope for %s\n",
@ -238,8 +239,10 @@ static void ipmi_ssdt(const struct device *dev)
return;
}
if (dev->chip_info)
conf = dev->chip_info;
if (!conf) {
printk(BIOS_WARNING, "IPMI: chip_info is missing!\n");
return;
}
/* Use command to pass UID to ipmi_write_acpi_tables */
conf->uid = uid_cnt++;
@ -257,11 +260,9 @@ static void ipmi_ssdt(const struct device *dev)
acpigen_write_io16(dev->path.pnp.port + CONFIG_IPMI_KCS_REGISTER_SPACING,
dev->path.pnp.port + CONFIG_IPMI_KCS_REGISTER_SPACING, 1, 1, 1);
if (conf) {
// FIXME: is that correct?
if (conf->have_apic)
acpigen_write_irq(1 << conf->apic_interrupt);
}
acpigen_write_resourcetemplate_footer();
@ -295,16 +296,13 @@ void ipmi_bmc_version(uint8_t *ipmi_bmc_major_revision, uint8_t *ipmi_bmc_minor_
static int ipmi_smbios_data(struct device *dev, int *handle,
unsigned long *current)
{
struct drivers_ipmi_config *conf = NULL;
struct drivers_ipmi_config *conf = dev->chip_info;
u8 nv_storage = 0xff;
u8 i2c_address = 0;
u8 register_spacing;
int len = 0;
if (dev->chip_info)
conf = dev->chip_info;
if (conf) {
if (conf->have_nv_storage)
nv_storage = conf->nv_storage_device_address;