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<m.korotkov@postgrespro.ru>writes:
> I found the case of potential NULL pointer dereference.
> In snowball/libstemmer/api.c if we transfer control to the SN_create_env() function
> by using the error label when there is a memory allocation error of z->p or z->S,
> we can then dereference the NULL pointer z->S in the function SN_close_env().
> Added the pointer check for avoiding a potential problem.
I believe you are right: OOM partway through SN_create_env would fail.
However, backend/snowball is not our code so applying our own local
patch is not the way to fix it. You should report this upstream;
see src/backend/snowball/README.
(Whenever they apply the patch, we should then re-sync...)
regards, tom lane
