netxen: validate unified romimage

Signed-off-by: Rajesh K Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>

Validate all sections of unified romimage, before accessing them,
  to avoid seg fault.

Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 140 insertions, 15 deletions

diff --git a/drivers/net/netxen/netxen_nic.h b/drivers/net/netxen/netxen_nic.h
index 144d2e880422..33ae5e13b608 100644
--- a/drivers/net/netxen/netxen_nic.h
+++ b/drivers/net/netxen/netxen_nic.h
@@ -420,7 +420,6 @@ struct status_desc {
 } __attribute__ ((aligned(16)));
 
 /* UNIFIED ROMIMAGE *************************/
-#define NX_UNI_FW_MIN_SIZE              0xc8000
 #define NX_UNI_DIR_SECT_PRODUCT_TBL     0x0
 #define NX_UNI_DIR_SECT_BOOTLD          0x6
 #define NX_UNI_DIR_SECT_FW              0x7
diff --git a/drivers/net/netxen/netxen_nic_init.c b/drivers/net/netxen/netxen_nic_init.c
index 1c63610ead42..141bc4389fec 100644
--- a/drivers/net/netxen/netxen_nic_init.c
+++ b/drivers/net/netxen/netxen_nic_init.c
@@ -613,22 +613,123 @@ static struct uni_table_desc *nx_get_table_desc(const u8 *unirom, int section)
         return NULL;
 }
 
+#define QLCNIC_FILEHEADER_SIZE  (14 * 4)
+
 static int
-nx_set_product_offs(struct netxen_adapter *adapter)
-{
-        struct uni_table_desc *ptab_descr;
+netxen_nic_validate_header(struct netxen_adapter *adapter)
+ {
         const u8 *unirom = adapter->fw->data;
-        uint32_t i;
+        struct uni_table_desc *directory = (struct uni_table_desc *) &unirom[0];
+        u32 fw_file_size = adapter->fw->size;
+        u32 tab_size;
         __le32 entries;
+        __le32 entry_size;
+
+        if (fw_file_size < QLCNIC_FILEHEADER_SIZE)
+                return -EINVAL;
+
+        entries = cpu_to_le32(directory->num_entries);
+        entry_size = cpu_to_le32(directory->entry_size);
+        tab_size = cpu_to_le32(directory->findex) + (entries * entry_size);
+
+        if (fw_file_size < tab_size)
+                return -EINVAL;
+
+        return 0;
+}
+
+static int
+netxen_nic_validate_bootld(struct netxen_adapter *adapter)
+{
+        struct uni_table_desc *tab_desc;
+        struct uni_data_desc *descr;
+        const u8 *unirom = adapter->fw->data;
+        __le32 idx = cpu_to_le32(*((int *)&unirom[adapter->file_prd_off] +
+                                NX_UNI_BOOTLD_IDX_OFF));
+        u32 offs;
+        u32 tab_size;
+        u32 data_size;
+
+        tab_desc = nx_get_table_desc(unirom, NX_UNI_DIR_SECT_BOOTLD);
+
+        if (!tab_desc)
+                return -EINVAL;
 
+        tab_size = cpu_to_le32(tab_desc->findex) +
+                        (cpu_to_le32(tab_desc->entry_size) * (idx + 1));
+
+        if (adapter->fw->size < tab_size)
+                return -EINVAL;
+
+        offs = cpu_to_le32(tab_desc->findex) +
+                (cpu_to_le32(tab_desc->entry_size) * (idx));
+        descr = (struct uni_data_desc *)&unirom[offs];
+
+        data_size = cpu_to_le32(descr->findex) + cpu_to_le32(descr->size);
+
+        if (adapter->fw->size < data_size)
+                return -EINVAL;
+
+        return 0;
+}
+
+static int
+netxen_nic_validate_fw(struct netxen_adapter *adapter)
+{
+        struct uni_table_desc *tab_desc;
+        struct uni_data_desc *descr;
+        const u8 *unirom = adapter->fw->data;
+        __le32 idx = cpu_to_le32(*((int *)&unirom[adapter->file_prd_off] +
+                                NX_UNI_FIRMWARE_IDX_OFF));
+        u32 offs;
+        u32 tab_size;
+        u32 data_size;
+
+        tab_desc = nx_get_table_desc(unirom, NX_UNI_DIR_SECT_FW);
+
+        if (!tab_desc)
+                return -EINVAL;
+
+        tab_size = cpu_to_le32(tab_desc->findex) +
+                        (cpu_to_le32(tab_desc->entry_size) * (idx + 1));
+
+        if (adapter->fw->size < tab_size)
+                return -EINVAL;
+
+        offs = cpu_to_le32(tab_desc->findex) +
+                (cpu_to_le32(tab_desc->entry_size) * (idx));
+        descr = (struct uni_data_desc *)&unirom[offs];
+        data_size = cpu_to_le32(descr->findex) + cpu_to_le32(descr->size);
+
+        if (adapter->fw->size < data_size)
+                return -EINVAL;
+
+        return 0;
+}
+
+
+static int
+netxen_nic_validate_product_offs(struct netxen_adapter *adapter)
+{
+        struct uni_table_desc *ptab_descr;
+        const u8 *unirom = adapter->fw->data;
         int mn_present = (NX_IS_REVISION_P2(adapter->ahw.revision_id)) ?
                         1 : netxen_p3_has_mn(adapter);
+        __le32 entries;
+        __le32 entry_size;
+        u32 tab_size;
+        u32 i;
 
         ptab_descr = nx_get_table_desc(unirom, NX_UNI_DIR_SECT_PRODUCT_TBL);
         if (ptab_descr == NULL)
-                return -1;
+                return -EINVAL;
 
         entries = cpu_to_le32(ptab_descr->num_entries);
+        entry_size = cpu_to_le32(ptab_descr->entry_size);
+        tab_size = cpu_to_le32(ptab_descr->findex) + (entries * entry_size);
+
+        if (adapter->fw->size < tab_size)
+                return -EINVAL;
 
 nomn:
         for (i = 0; i < entries; i++) {
@@ -657,9 +758,38 @@ nomn:
                 goto nomn;
         }
 
-        return -1;
+        return -EINVAL;
 }
 
+static int
+netxen_nic_validate_unified_romimage(struct netxen_adapter *adapter)
+{
+        if (netxen_nic_validate_header(adapter)) {
+                dev_err(&adapter->pdev->dev,
+                                "unified image: header validation failed\n");
+                return -EINVAL;
+        }
+
+        if (netxen_nic_validate_product_offs(adapter)) {
+                dev_err(&adapter->pdev->dev,
+                                "unified image: product validation failed\n");
+                return -EINVAL;
+        }
+
+        if (netxen_nic_validate_bootld(adapter)) {
+                dev_err(&adapter->pdev->dev,
+                                "unified image: bootld validation failed\n");
+                return -EINVAL;
+        }
+
+        if (netxen_nic_validate_fw(adapter)) {
+                dev_err(&adapter->pdev->dev,
+                                "unified image: firmware validation failed\n");
+                return -EINVAL;
+        }
+
+        return 0;
+}
 
 static struct uni_data_desc *nx_get_data_desc(struct netxen_adapter *adapter,
                         u32 section, u32 idx_offset)
@@ -933,27 +1063,23 @@ static int
 netxen_validate_firmware(struct netxen_adapter *adapter)
 {
         __le32 val;
-        u32 ver, min_ver, bios, min_size;
+        u32 ver, min_ver, bios;
         struct pci_dev *pdev = adapter->pdev;
         const struct firmware *fw = adapter->fw;
         u8 fw_type = adapter->fw_type;
 
         if (fw_type == NX_UNIFIED_ROMIMAGE) {
-                if (nx_set_product_offs(adapter))
+                if (netxen_nic_validate_unified_romimage(adapter))
                         return -EINVAL;
-
-                min_size = NX_UNI_FW_MIN_SIZE;
         } else {
                 val = cpu_to_le32(*(u32 *)&fw->data[NX_FW_MAGIC_OFFSET]);
                 if ((__force u32)val != NETXEN_BDINFO_MAGIC)
                         return -EINVAL;
 
-                min_size = NX_FW_MIN_SIZE;
+                if (fw->size < NX_FW_MIN_SIZE)
+                        return -EINVAL;
         }
 
-        if (fw->size < min_size)
-                return -EINVAL;
-
         val = nx_get_fw_version(adapter);
 
         if (NX_IS_REVISION_P3(adapter->ahw.revision_id))