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print: Return sunk reference from deserialize function

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This function was always documented to return a sunk reference, but it
did not do so. This change is technically backward incompatible.

However, it only has an effect if anything is doing a g_object_ref_sink.
Which may happen inside libfprint itself. With the change, most API
users (including fprintd) are fixed to do refcounting correctly. Any API
user which worked around this will have a memory leak now.

That is not ideal, but it is not really that bad overall. And returning
a floating reference for FpPrint creation was a bad idea in the first
place. And it really only makes sense for fp_print_new as the only
(public) use case is to create the template for enrollment.
This commit is contained in:
Benjamin Berg
2020-12-09 10:46:36 +01:00
parent 0ff7a07671
commit 499de3e442
1 changed files with 2 additions and 0 deletions
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2
libfprint/fp-print.c
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@@ -808,6 +808,7 @@ fp_print_deserialize (const guchar *data,
"device-id", device_id, "device-id", device_id,
"device-stored", device_stored, "device-stored", device_stored,
NULL); NULL);
g_object_ref_sink (result);
fpi_print_set_type (result, FPI_PRINT_NBIS); fpi_print_set_type (result, FPI_PRINT_NBIS);
for (i = 0; i < g_variant_n_children (prints); i++) for (i = 0; i < g_variant_n_children (prints); i++)
{ {
@@ -857,6 +858,7 @@ fp_print_deserialize (const guchar *data,
"device-stored", device_stored, "device-stored", device_stored,
"fpi-data", fp_data, "fpi-data", fp_data,
NULL); NULL);
g_object_ref_sink (result);
} }
else else
{ {