upstream commit taken as below
Original Issue link
https://android-review.googlesource.com/c/platform/system/core/+/1123485

Commit taken below:

fastboot: don't use sparse_file_import_auto() in load_buf_fd()

load_buf_fd() attempts to find the size of the file that it is about
to load by first calling sparse_file_import_auto() then using
sparse_file_len() upon success or falling back to the file size on the
filesystem on failure.

This is problematic however as sparse_file_import_auto() creates a
sparse_file out of the normal file, but does not resparse it, so an
assertion fails during the sparse_file_len() call.

This is fixed by using sparse_file_import() instead.  This will fail
in the case that the file is not sparse and the call to
sparse_file_len() will be properly skipped.

Bug: 140538105
Test: flash blueline factory image with assertions enabled in
      libsparse/sparse.cpp

Change-Id: I0283be33563a3301ce5b09bde41105a20f91086c

https://android.googlesource.com/platform/system/core/+/fbb9535aaea5ae4011f3c3edf4c00b27452f57ec
Upstream-Status: Backport(commit fbb9535aaea5ae4011f3c3edf4c00b27452f57ec)
Signed-off-by: Nisha Parrakat <Nisha.Parrakat@kpit.com>

--- git/system/core/fastboot/fastboot.cpp	2021-05-28 09:24:15.583963227 +0000
+++ git/system/core/fastboot/fastboot.cpp	2021-05-28 09:25:09.948974990 +0000
@@ -869,7 +869,7 @@
         return false;
     }
 
-    if (sparse_file* s = sparse_file_import_auto(fd, false, false)) {
+    if (sparse_file* s = sparse_file_import(fd, false, false)) {
         buf->image_size = sparse_file_len(s, false, false);
         sparse_file_destroy(s);
     } else {