Merge 84a07bbd2f7e0d5c7b906a74b006c17cf05f931c on remote branch

Change-Id: I7427f32b145162f16b9bae11bc51f1a56f1933aa

1 files changed, 11 insertions, 4 deletions

diff --git a/QcomModulePkg/Library/avb/libavb/avb_slot_verify.c b/QcomModulePkg/Library/avb/libavb/avb_slot_verify.c
index 62bf5f17f6..fb6fc7976b 100644
--- a/QcomModulePkg/Library/avb/libavb/avb_slot_verify.c
+++ b/QcomModulePkg/Library/avb/libavb/avb_slot_verify.c
@@ -384,7 +384,7 @@ static AvbSlotVerifyResult load_and_verify_vbmeta(
   size_t num_descriptors;
   size_t n;
   bool is_main_vbmeta;
-  bool is_vbmeta_partition;
+  bool look_for_vbmeta_footer;
   AvbVBMetaData* vbmeta_image_data = NULL;
 
   ret = AVB_SLOT_VERIFY_RESULT_OK;
@@ -399,7 +399,14 @@ static AvbSlotVerifyResult load_and_verify_vbmeta(
    * vbmeta struct.
    */
   is_main_vbmeta = (rollback_index_location == 0);
-  is_vbmeta_partition = (avb_strcmp(partition_name, "vbmeta") == 0);
+
+  /* Don't use footers for vbmeta partitions ('vbmeta' or
+   * 'vbmeta_<partition_name>').
+   */
+  look_for_vbmeta_footer = true;
+  if (Avb_StrnCmp(partition_name, "vbmeta", avb_strlen("vbmeta")) == 0) {
+    look_for_vbmeta_footer = false;
+  }
 
   if (!avb_validate_utf8((const uint8_t*)partition_name, partition_name_len)) {
     avb_error("Partition name is not valid UTF-8.\n");
@@ -427,7 +434,7 @@ static AvbSlotVerifyResult load_and_verify_vbmeta(
    */
   vbmeta_offset = 0;
   vbmeta_size = VBMETA_MAX_SIZE;
-  if (!is_vbmeta_partition) {
+  if (look_for_vbmeta_footer) {
     uint8_t footer_buf[AVB_FOOTER_SIZE];
     size_t footer_num_read;
     AvbFooter footer;
@@ -495,7 +502,7 @@ static AvbSlotVerifyResult load_and_verify_vbmeta(
      * go try to get it from the boot partition instead.
      */
     if (is_main_vbmeta && io_ret == AVB_IO_RESULT_ERROR_NO_SUCH_PARTITION &&
-        is_vbmeta_partition) {
+        !look_for_vbmeta_footer) {
       avb_debugv(full_partition_name,
                  ": No such partition. Trying 'boot' instead.\n",
                  NULL);