qlcnic: validate unified fw image

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

Signed-off-by: Sucheta Chakraborty <sucheta@dut6195.unminc.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 139 insertions, 7 deletions

diff --git a/drivers/net/qlcnic/qlcnic_init.c b/drivers/net/qlcnic/qlcnic_init.c
index f0df9717aece..21a6e9f3dac5 100644
--- a/drivers/net/qlcnic/qlcnic_init.c
+++ b/drivers/net/qlcnic/qlcnic_init.c
@@ -568,21 +568,123 @@ struct uni_table_desc *qlcnic_get_table_desc(const u8 *unirom, int section)
         return NULL;
 }
 
+#define FILEHEADER_SIZE (14 * 4)
+
 static int
-qlcnic_set_product_offs(struct qlcnic_adapter *adapter)
+qlcnic_validate_header(struct qlcnic_adapter *adapter)
 {
-        struct uni_table_desc *ptab_descr;
         const u8 *unirom = adapter->fw->data;
-        u32 i;
+        struct uni_table_desc *directory = (struct uni_table_desc *) &unirom[0];
+        __le32 fw_file_size = adapter->fw->size;
         __le32 entries;
+        __le32 entry_size;
+        __le32 tab_size;
+
+        if (fw_file_size < 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
+qlcnic_validate_bootld(struct qlcnic_adapter *adapter)
+{
+        struct uni_table_desc *tab_desc;
+        struct uni_data_desc *descr;
+        const u8 *unirom = adapter->fw->data;
+        int idx = cpu_to_le32(*((int *)&unirom[adapter->file_prd_off] +
+                                QLCNIC_UNI_BOOTLD_IDX_OFF));
+        __le32 offs;
+        __le32 tab_size;
+        __le32 data_size;
+
+        tab_desc = qlcnic_get_table_desc(unirom, QLCNIC_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 = descr->findex + cpu_to_le32(descr->size);
+
+        if (adapter->fw->size < data_size)
+                return -EINVAL;
+
+        return 0;
+}
+
+static int
+qlcnic_validate_fw(struct qlcnic_adapter *adapter)
+{
+        struct uni_table_desc *tab_desc;
+        struct uni_data_desc *descr;
+        const u8 *unirom = adapter->fw->data;
+        int idx = cpu_to_le32(*((int *)&unirom[adapter->file_prd_off] +
+                                QLCNIC_UNI_FIRMWARE_IDX_OFF));
+        __le32 offs;
+        __le32 tab_size;
+        __le32 data_size;
+
+        tab_desc = qlcnic_get_table_desc(unirom, QLCNIC_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 = descr->findex + cpu_to_le32(descr->size);
+
+        if (adapter->fw->size < data_size)
+                return -EINVAL;
+
+        return 0;
+}
+
+static int
+qlcnic_validate_product_offs(struct qlcnic_adapter *adapter)
+{
+        struct uni_table_desc *ptab_descr;
+        const u8 *unirom = adapter->fw->data;
         int mn_present = qlcnic_has_mn(adapter);
+        __le32 entries;
+        __le32 entry_size;
+        __le32 tab_size;
+        u32 i;
 
         ptab_descr = qlcnic_get_table_desc(unirom,
                                 QLCNIC_UNI_DIR_SECT_PRODUCT_TBL);
-        if (ptab_descr == NULL)
-                return -1;
+        if (!ptab_descr)
+                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++) {
 
@@ -609,7 +711,37 @@ nomn:
                 mn_present = 0;
                 goto nomn;
         }
-        return -1;
+        return -EINVAL;
+}
+
+static int
+qlcnic_validate_unified_romimage(struct qlcnic_adapter *adapter)
+{
+        if (qlcnic_validate_header(adapter)) {
+                dev_err(&adapter->pdev->dev,
+                                "unified image: header validation failed\n");
+                return -EINVAL;
+        }
+
+        if (qlcnic_validate_product_offs(adapter)) {
+                dev_err(&adapter->pdev->dev,
+                                "unified image: product validation failed\n");
+                return -EINVAL;
+        }
+
+        if (qlcnic_validate_bootld(adapter)) {
+                dev_err(&adapter->pdev->dev,
+                                "unified image: bootld validation failed\n");
+                return -EINVAL;
+        }
+
+        if (qlcnic_validate_fw(adapter)) {
+                dev_err(&adapter->pdev->dev,
+                                "unified image: firmware validation failed\n");
+                return -EINVAL;
+        }
+
+        return 0;
 }
 
 static
@@ -858,7 +990,7 @@ qlcnic_validate_firmware(struct qlcnic_adapter *adapter)
         u8 fw_type = adapter->fw_type;
 
         if (fw_type == QLCNIC_UNIFIED_ROMIMAGE) {
-                if (qlcnic_set_product_offs(adapter))
+                if (qlcnic_validate_unified_romimage(adapter))
                         return -EINVAL;
 
                 min_size = QLCNIC_UNI_FW_MIN_SIZE;