avb: free mmc_part allocated by get_partition()

get_partition() returns a malloc()'d struct mmc_part and only frees it on
its own internal error path. None of its callers - mmc_byte_io(),
get_unique_guid_for_partition() and get_size_of_partition() - free the
returned pointer, so every partition access leaks one struct mmc_part.
A single "avb verify" issues many such accesses (footer, vbmeta and the
hashed image chunks), so the leak accumulates quickly.

Free the descriptor in all three callers. mmc_byte_io() is reworked to
use a single exit path so the partition is released on every return.

Fixes: 3af30e4443aa ("avb2.0: implement AVB ops")
Signed-off-by: Igor Opaniuk <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mattijs Korpershoek <[email protected]>

0 files changed, 0 insertions, 0 deletions