[PATCH] drm/amdgpu: refine amdgpu_fru_get_product_info

[Jiansong Chen]

1. eliminate potential array index out of bounds.
2. return meaningful value for failure.

Signed-off-by: Jiansong Chen <Jiansong.Chen at amd.com>
Change-Id: I9be36eb2e42ee46cd00464b0f2c35a4e4ea213e3
---
 .../gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c    | 69 ++++++++++---------
 1 file changed, 35 insertions(+), 34 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
index 8f4a8f8d8146..5c2b4403a5b6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fru_eeprom.c
@@ -101,7 +101,8 @@ static int amdgpu_fru_read_eeprom(struct amdgpu_device *adev, uint32_t addrptr,
 int amdgpu_fru_get_product_info(struct amdgpu_device *adev)
 {
 	unsigned char buff[34];
-	int addrptr = 0, size = 0;
+	int addrptr, size;
+	int len;
 
 	if (!is_fru_eeprom_supported(adev))
 		return 0;
@@ -109,7 +110,7 @@ int amdgpu_fru_get_product_info(struct amdgpu_device *adev)
 	/* If algo exists, it means that the i2c_adapter's initialized */
 	if (!adev->pm.smu_i2c.algo) {
 		DRM_WARN("Cannot access FRU, EEPROM accessor not initialized");
-		return 0;
+		return -ENODEV;
 	}
 
 	/* There's a lot of repetition here. This is due to the FRU having
@@ -125,75 +126,75 @@ int amdgpu_fru_get_product_info(struct amdgpu_device *adev)
 	 * and the language field, so just start from 0xb, manufacturer size
 	 */
 	addrptr = 0xb;
-	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
-	if (size < 1) {
-		DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", size);
-		return size;
+	len = size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+	if (len < 1) {
+		DRM_ERROR("Failed to read FRU Manufacturer, ret:%d", len);
+		return -EINVAL;
 	}
 
 	/* Increment the addrptr by the size of the field, and 1 due to the
 	 * size field being 1 byte. This pattern continues below.
 	 */
 	addrptr += size + 1;
-	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
-	if (size < 1) {
-		DRM_ERROR("Failed to read FRU product name, ret:%d", size);
-		return size;
+	len = size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+	if (len < 1) {
+		DRM_ERROR("Failed to read FRU product name, ret:%d", len);
+		return -EINVAL;
 	}
 
 	/* Product name should only be 32 characters. Any more,
 	 * and something could be wrong. Cap it at 32 to be safe
 	 */
-	if (size > 32) {
+	if (len >= sizeof(adev->product_name)) {
 		DRM_WARN("FRU Product Number is larger than 32 characters. This is likely a mistake");
-		size = 32;
+		len = sizeof(adev->product_name) - 1;
 	}
 	/* Start at 2 due to buff using fields 0 and 1 for the address */
-	memcpy(adev->product_name, &buff[2], size);
-	adev->product_name[size] = '\0';
+	memcpy(adev->product_name, &buff[2], len);
+	adev->product_name[len] = '\0';
 
 	addrptr += size + 1;
-	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
-	if (size < 1) {
-		DRM_ERROR("Failed to read FRU product number, ret:%d", size);
-		return size;
+	len = size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+	if (len < 1) {
+		DRM_ERROR("Failed to read FRU product number, ret:%d", len);
+		return -EINVAL;
 	}
 
 	/* Product number should only be 16 characters. Any more,
 	 * and something could be wrong. Cap it at 16 to be safe
 	 */
-	if (size > 16) {
+	if (len >= sizeof(adev->product_number)) {
 		DRM_WARN("FRU Product Number is larger than 16 characters. This is likely a mistake");
-		size = 16;
+		len = sizeof(adev->product_number) - 1;
 	}
-	memcpy(adev->product_number, &buff[2], size);
-	adev->product_number[size] = '\0';
+	memcpy(adev->product_number, &buff[2], len);
+	adev->product_number[len] = '\0';
 
 	addrptr += size + 1;
-	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+	len = size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
 
-	if (size < 1) {
-		DRM_ERROR("Failed to read FRU product version, ret:%d", size);
-		return size;
+	if (len < 1) {
+		DRM_ERROR("Failed to read FRU product version, ret:%d", len);
+		return -EINVAL;
 	}
 
 	addrptr += size + 1;
-	size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
+	len = size = amdgpu_fru_read_eeprom(adev, addrptr, buff);
 
-	if (size < 1) {
-		DRM_ERROR("Failed to read FRU serial number, ret:%d", size);
-		return size;
+	if (len < 1) {
+		DRM_ERROR("Failed to read FRU serial number, ret:%d", len);
+		return -EINVAL;
 	}
 
 	/* Serial number should only be 16 characters. Any more,
 	 * and something could be wrong. Cap it at 16 to be safe
 	 */
-	if (size > 16) {
+	if (len >= sizeof(adev->serial)) {
 		DRM_WARN("FRU Serial Number is larger than 16 characters. This is likely a mistake");
-		size = 16;
+		len = sizeof(adev->serial) - 1;
 	}
-	memcpy(adev->serial, &buff[2], size);
-	adev->serial[size] = '\0';
+	memcpy(adev->serial, &buff[2], len);
+	adev->serial[len] = '\0';
 
 	return 0;
 }
-- 
2.25.1