diff --git a/app/aboot/aboot.c b/app/aboot/aboot.c
index d50be73..a2594d3 100644
--- a/app/aboot/aboot.c
+++ b/app/aboot/aboot.c
@@ -1401,6 +1401,11 @@
 
 	/* Read and skip over sparse image header */
 	sparse_header = (sparse_header_t *) data;
+	if ((sparse_header->total_blks * sparse_header->blk_sz) > size) {
+		fastboot_fail("size too large");
+		return;
+	}
+
 	data += sparse_header->file_hdr_sz;
 	if(sparse_header->file_hdr_sz > sizeof(sparse_header_t))
 	{