bloblist: Zero records when adding

It is convenient for bloblist to zero out the contents of a records when
it is added. This saves the callers having to do it.

Update the API accordingly.

Signed-off-by: Simon Glass <sjg@chromium.org>

3 files changed, 30 insertions, 4 deletions

diff --git a/common/bloblist.c b/common/bloblist.c
index 3d0fbbf67d3..99501951e0c 100644
--- a/common/bloblist.c
+++ b/common/bloblist.c
@@ -73,6 +73,9 @@ static int bloblist_addrec(uint tag, int size, struct bloblist_rec **recp)
 	rec->hdr_size = sizeof(*rec);
 	rec->size = size;
 	rec->spare = 0;
+
+	/* Zero the record data */
+	memset(rec + 1, '\0', rec->size);
 	*recp = rec;
 
 	return 0;
diff --git a/doc/README.bloblist b/doc/README.bloblist
index b0e787b97db..274c4605571 100644
--- a/doc/README.bloblist
+++ b/doc/README.bloblist
@@ -55,8 +55,8 @@ a single bloblist.
 API
 ---
 
-Bloblist provides a fairly simple API which allows blobs to be created  and
-found. All access is via the blob's tag.
+Bloblist provides a fairly simple API which allows blobs to be created and
+found. All access is via the blob's tag. Blob records are zeroed when added.
 
 
 Finishing the bloblist
diff --git a/test/bloblist.c b/test/bloblist.c
index c78b58ea293..bdcca0291c7 100644
--- a/test/bloblist.c
+++ b/test/bloblist.c
@@ -34,13 +34,31 @@ static struct bloblist_hdr *clear_bloblist(void)
 {
 	struct bloblist_hdr *hdr;
 
-	/* Clear out any existing bloblist so we have a clean slate */
+	/*
+	 * Clear out any existing bloblist so we have a clean slate. Zero the
+	 * header so that existing records are removed, but set everything else
+	 * to 0xff for testing purposes.
+	 */
 	hdr = map_sysmem(CONFIG_BLOBLIST_ADDR, TEST_BLOBLIST_SIZE);
-	memset(hdr, '\0', TEST_BLOBLIST_SIZE);
+	memset(hdr, '\xff', TEST_BLOBLIST_SIZE);
+	memset(hdr, '\0', sizeof(*hdr));
 
 	return hdr;
 }
 
+static int check_zero(void *data, int size)
+{
+	u8 *ptr;
+	int i;
+
+	for (ptr = data, i = 0; i < size; i++, ptr++) {
+		if (*ptr)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
 static int bloblist_test_init(struct unit_test_state *uts)
 {
 	struct bloblist_hdr *hdr;
@@ -84,10 +102,14 @@ static int bloblist_test_blob(struct unit_test_state *uts)
 	data = bloblist_find(TEST_TAG, TEST_SIZE);
 	ut_asserteq_ptr(rec + 1, data);
 
+	/* Check the data is zeroed */
+	ut_assertok(check_zero(data, TEST_SIZE));
+
 	/* Check the 'ensure' method */
 	ut_asserteq_ptr(data, bloblist_ensure(TEST_TAG, TEST_SIZE));
 	ut_assertnull(bloblist_ensure(TEST_TAG, TEST_SIZE2));
 	rec2 = (struct bloblist_rec *)(data + ALIGN(TEST_SIZE, BLOBLIST_ALIGN));
+	ut_assertok(check_zero(data, TEST_SIZE));
 
 	/* Check for a non-existent record */
 	ut_asserteq_ptr(data, bloblist_ensure(TEST_TAG, TEST_SIZE));
@@ -112,6 +134,7 @@ static int bloblist_test_blob_ensure(struct unit_test_state *uts)
 	size = TEST_SIZE;
 	ut_assertok(bloblist_ensure_size_ret(TEST_TAG, &size, &data));
 	ut_asserteq(TEST_SIZE, size);
+	ut_assertok(check_zero(data, TEST_SIZE));
 
 	/* Check that we get the same thing again */
 	ut_assertok(bloblist_ensure_size_ret(TEST_TAG, &size, &data2));