Hello!

The fix itself looks good to me, I only seem some issues in the test.

--- a/src/interfaces/ecpg/test/pgtypeslib/dt_test2.pgc
+++ b/src/interfaces/ecpg/test/pgtypeslib/dt_test2.pgc

If the test produces additional output, you should also update the
output file. (but also see my later comment about this)

+       char large_fmt[10000] = {
+               [0] = '%',
+               [1] = 'D',
+               [2 ... 9998] = 'A'
+       };
+

2...9998 is a GNU extension, it won't compile on MSVC.

+       PGTYPEStimestamp_defmt_asc("1 minute", large_fmt, &ts1);
+       printf("Success parsing large string\n");

Won't this fail parsing? I am not saying that it wouldn't trigger an
asan/valgrind report when executed with that and the original code,
but that printed message is misleading. (it won't succeed ; we aren't
parsing a large string, it's a small string parsed with a large format
string). It also only tests 1 of the 4 fixed locations.
I probably wouldn't print anything for these tests, as the output
won't help deciding if the test failed or passed, it is always the
same. Maybe a comment explaining that these calls can trigger
asan/valgrind would be more useful?

> For anyone reviewing (I at least won't have time for a few days):
> there is also an earlier patch submitted for fixing this bug which should be
> considered to make sure we pick the best fix.

These seems to be similar but different issue to me.


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