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path: root/drivers/net/wireless/iwlwifi/mvm/nvm.c
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Diffstat (limited to 'drivers/net/wireless/iwlwifi/mvm/nvm.c')
-rw-r--r--drivers/net/wireless/iwlwifi/mvm/nvm.c35
1 files changed, 29 insertions, 6 deletions
diff --git a/drivers/net/wireless/iwlwifi/mvm/nvm.c b/drivers/net/wireless/iwlwifi/mvm/nvm.c
index 808f78f..cfdd314 100644
--- a/drivers/net/wireless/iwlwifi/mvm/nvm.c
+++ b/drivers/net/wireless/iwlwifi/mvm/nvm.c
@@ -69,7 +69,9 @@
/* Default NVM size to read */
#define IWL_NVM_DEFAULT_CHUNK_SIZE (2*1024)
-#define IWL_MAX_NVM_SECTION_SIZE 7000
+#define IWL_MAX_NVM_SECTION_SIZE 0x1b58
+#define IWL_MAX_NVM_8000A_SECTION_SIZE 0xffc
+#define IWL_MAX_NVM_8000B_SECTION_SIZE 0x1ffc
#define NVM_WRITE_OPCODE 1
#define NVM_READ_OPCODE 0
@@ -219,7 +221,7 @@ static int iwl_nvm_write_section(struct iwl_mvm *mvm, u16 section,
* without overflowing, so no check is needed.
*/
static int iwl_nvm_read_section(struct iwl_mvm *mvm, u16 section,
- u8 *data)
+ u8 *data, u32 size_read)
{
u16 length, offset = 0;
int ret;
@@ -231,6 +233,13 @@ static int iwl_nvm_read_section(struct iwl_mvm *mvm, u16 section,
/* Read the NVM until exhausted (reading less than requested) */
while (ret == length) {
+ /* Check no memory assumptions fail and cause an overflow */
+ if ((size_read + offset + length) >
+ mvm->cfg->base_params->eeprom_size) {
+ IWL_ERR(mvm, "EEPROM size is too small for NVM\n");
+ return -ENOBUFS;
+ }
+
ret = iwl_nvm_read_chunk(mvm, section, offset, length, data);
if (ret < 0) {
IWL_DEBUG_EEPROM(mvm->trans->dev,
@@ -256,7 +265,7 @@ iwl_parse_nvm_sections(struct iwl_mvm *mvm)
if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000) {
if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
!mvm->nvm_sections[mvm->cfg->nvm_hw_section_num].data) {
- IWL_ERR(mvm, "Can't parse empty NVM sections\n");
+ IWL_ERR(mvm, "Can't parse empty OTP/NVM sections\n");
return NULL;
}
} else {
@@ -264,7 +273,7 @@ iwl_parse_nvm_sections(struct iwl_mvm *mvm)
if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
!mvm->nvm_sections[NVM_SECTION_TYPE_REGULATORY].data) {
IWL_ERR(mvm,
- "Can't parse empty family 8000 NVM sections\n");
+ "Can't parse empty family 8000 OTP/NVM sections\n");
return NULL;
}
/* MAC_OVERRIDE or at least HW section must exist */
@@ -326,6 +335,7 @@ static int iwl_mvm_read_external_nvm(struct iwl_mvm *mvm)
u8 data[];
} *file_sec;
const u8 *eof, *temp;
+ int max_section_size;
#define NVM_WORD1_LEN(x) (8 * (x & 0x03FF))
#define NVM_WORD2_ID(x) (x >> 12)
@@ -334,6 +344,14 @@ static int iwl_mvm_read_external_nvm(struct iwl_mvm *mvm)
IWL_DEBUG_EEPROM(mvm->trans->dev, "Read from external NVM\n");
+ /* Maximal size depends on HW family and step */
+ if (mvm->trans->cfg->device_family != IWL_DEVICE_FAMILY_8000)
+ max_section_size = IWL_MAX_NVM_SECTION_SIZE;
+ else if ((mvm->trans->hw_rev & 0xc) == 0) /* Family 8000 A-step */
+ max_section_size = IWL_MAX_NVM_8000A_SECTION_SIZE;
+ else /* Family 8000 B-step */
+ max_section_size = IWL_MAX_NVM_8000B_SECTION_SIZE;
+
/*
* Obtain NVM image via request_firmware. Since we already used
* request_firmware_nowait() for the firmware binary load and only
@@ -392,7 +410,7 @@ static int iwl_mvm_read_external_nvm(struct iwl_mvm *mvm)
le16_to_cpu(file_sec->word1));
}
- if (section_size > IWL_MAX_NVM_SECTION_SIZE) {
+ if (section_size > max_section_size) {
IWL_ERR(mvm, "ERROR - section too large (%d)\n",
section_size);
ret = -EINVAL;
@@ -459,6 +477,7 @@ int iwl_mvm_load_nvm_to_nic(struct iwl_mvm *mvm)
int iwl_nvm_init(struct iwl_mvm *mvm, bool read_nvm_from_nic)
{
int ret, section;
+ u32 size_read = 0;
u8 *nvm_buffer, *temp;
if (WARN_ON_ONCE(mvm->cfg->nvm_hw_section_num >= NVM_MAX_NUM_SECTIONS))
@@ -475,9 +494,11 @@ int iwl_nvm_init(struct iwl_mvm *mvm, bool read_nvm_from_nic)
return -ENOMEM;
for (section = 0; section < NVM_MAX_NUM_SECTIONS; section++) {
/* we override the constness for initial read */
- ret = iwl_nvm_read_section(mvm, section, nvm_buffer);
+ ret = iwl_nvm_read_section(mvm, section, nvm_buffer,
+ size_read);
if (ret < 0)
continue;
+ size_read += ret;
temp = kmemdup(nvm_buffer, ret, GFP_KERNEL);
if (!temp) {
ret = -ENOMEM;
@@ -509,6 +530,8 @@ int iwl_nvm_init(struct iwl_mvm *mvm, bool read_nvm_from_nic)
}
#endif
}
+ if (!size_read)
+ IWL_ERR(mvm, "OTP is blank\n");
kfree(nvm_buffer);
}
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