Обсуждение: BUG #18770: The function 'packGraph ' causes a memory leak.

The following bug has been logged on the website:

Bug reference:      18770
Logged by:          fengyao
Email address:      2365868844@qq.com
PostgreSQL version: 17.2
Operating system:   linux
Description:

Hello, 

In line 1965 of the trgm_regexp.c file

1965:    arcs = (TrgmPackArcInfo *)
1966:        palloc(sizeof(TrgmPackArcInfo) * trgmNFA->arcsCount);

The memory requested 'arcs' was not freed.

Have a good day!

PG Bug reporting form <noreply@postgresql.org> writes:
> In line 1965 of the trgm_regexp.c file
> 1965:    arcs = (TrgmPackArcInfo *)
> 1966:        palloc(sizeof(TrgmPackArcInfo) * trgmNFA->arcsCount);
> The memory requested 'arcs' was not freed.

This is not a bug, unless you can show that the memory is allocated
in a long-lived context that won't get freed reasonably soon.  We
generally assume that letting memory context cleanup recover memory
is both faster and more oversight-proof than retail pfree calls.

In this particular case, it looks to me like the memory will come from
the temp context made by createTrgmNFA, and therefore will be freed
before that returns.

            regards, tom lane