[PATCH 3/5] board: phytec: check eeprom_data validity

Daniel Schultz
2024-04-19T16:22:48Z

From: Yannic Moog <y.moog@phytec.de>

For all of the functions that access the eeprom_data, make sure these
data are valid. Use the valid member of the phytec_eeprom_data struct.
This fixes a bug where only the API revision check guarded against
accessing rubbish. But if API revision was e.g. 6, eeprom setup failed
before, but phytec_get_imx8m_eth would still happily access the data.

Fixes: dc22188cdc8 ("board: phytec: Add common PHYTEC SoM detection")

Signed-off-by: Yannic Moog <y.moog@phytec.de>
Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
---
board/phytec/common/imx8m_som_detection.c | 11 +++++++----
board/phytec/common/phytec_som_detection.c | 10 +++++++---
2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/board/phytec/common/imx8m_som_detection.c b/board/phytec/common/imx8m_som_detection.c
index 7571076a09e..ee34a5b9579 100644
--- a/board/phytec/common/imx8m_som_detection.c
+++ b/board/phytec/common/imx8m_som_detection.c
@@ -34,7 +34,7 @@ int __maybe_unused phytec_imx8m_detect(struct phytec_eeprom_data *data)
data = &eeprom_data;

/* We can not do the check for early API revisions */
- if (data->payload.api_rev < PHYTEC_API_REV2)
+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
return -1;

som = data->payload.data.data_api2.som_no;
@@ -75,6 +75,9 @@ u8 __maybe_unused phytec_get_imx8m_ddr_size(struct phytec_eeprom_data *data)
if (!data)
data = &eeprom_data;

+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
+ return PHYTEC_EEPROM_INVAL;
+
opt = phytec_get_opt(data);
if (opt)
ddr_id = PHYTEC_GET_OPTION(opt[2]);
@@ -99,7 +102,7 @@ u8 __maybe_unused phytec_get_imx8m_spi(struct phytec_eeprom_data *data)
if (!data)
data = &eeprom_data;

- if (data->payload.api_rev < PHYTEC_API_REV2)
+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
return PHYTEC_EEPROM_INVAL;

opt = phytec_get_opt(data);
@@ -126,7 +129,7 @@ u8 __maybe_unused phytec_get_imx8m_eth(struct phytec_eeprom_data *data)
if (!data)
data = &eeprom_data;

- if (data->payload.api_rev < PHYTEC_API_REV2)
+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
return PHYTEC_EEPROM_INVAL;

opt = phytec_get_opt(data);
@@ -154,7 +157,7 @@ u8 __maybe_unused phytec_get_imx8mp_rtc(struct phytec_eeprom_data *data)
if (!data)
data = &eeprom_data;

- if (data->payload.api_rev < PHYTEC_API_REV2)
+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
return PHYTEC_EEPROM_INVAL;

opt = phytec_get_opt(data);
diff --git a/board/phytec/common/phytec_som_detection.c b/board/phytec/common/phytec_som_detection.c
index 7913764be0a..5a4cc9e8b02 100644
--- a/board/phytec/common/phytec_som_detection.c
+++ b/board/phytec/common/phytec_som_detection.c
@@ -128,7 +128,7 @@ void __maybe_unused phytec_print_som_info(struct phytec_eeprom_data *data)
if (!data)
data = &eeprom_data;

- if (data->payload.api_rev < PHYTEC_API_REV2)
+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
return;

api2 = &data->payload.data.data_api2;
@@ -190,6 +190,9 @@ char * __maybe_unused phytec_get_opt(struct phytec_eeprom_data *data)
if (!data)
data = &eeprom_data;

+ if (!data->valid)
+ return NULL;
+
if (data->payload.api_rev < PHYTEC_API_REV2)
opt = data->payload.data.data_api0.opt;
else
@@ -205,7 +208,7 @@ u8 __maybe_unused phytec_get_rev(struct phytec_eeprom_data *data)
if (!data)
data = &eeprom_data;

- if (data->payload.api_rev < PHYTEC_API_REV2)
+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
return PHYTEC_EEPROM_INVAL;

api2 = &data->payload.data.data_api2;
@@ -217,7 +220,8 @@ u8 __maybe_unused phytec_get_som_type(struct phytec_eeprom_data *data)
{
if (!data)
data = &eeprom_data;
- if (data->payload.api_rev < PHYTEC_API_REV2)
+
+ if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
return PHYTEC_EEPROM_INVAL;

return data->payload.data.data_api2.som_type;
--
2.25.1