[PATCH v2] cmd: avb: free partition buffer upon verify completion

[Gary Bisson <gary.bisson@boundarydevices.com>]

Doing the same as the unittests for libavb [1].

Allows to run 'avb verify' multiple times which can be useful after a
failure to be able to re-flash the partition and try again.

[1]
https://android.googlesource.com/platform/external/avb/+/refs/tags/android-9.0.0_r37/test/avb_slot_verify_unittest.cc#156

Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
---
Hi,

Changelog v2:
- use avb_slot_verity_data_free as suggested by Igor

This was added because of the following scenario:
1- fastboot flash boot boot.img
2- avb verify
  -> fails because vbmeta wasn't updated
3- fastboot flash vbmeta vbmeta.img
4- avb verify
  -> fails because it can't allocate memory as previous buffer wasn't
freed

Let me know if you have any questions.

Regards,
Gary
---
 cmd/avb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cmd/avb.c b/cmd/avb.c
index a4de5c40a2..93d1a31819 100644
--- a/cmd/avb.c
+++ b/cmd/avb.c
@@ -312,6 +312,9 @@ int do_avb_verify_part(cmd_tbl_t *cmdtp, int flag,
 		printf("Unknown error occurred\n");
 	}
 
+	if (out_data)
+		avb_slot_verify_data_free(out_data);
+
 	return res;
 }
 
-- 
2.26.2