Re: [PATCH] dynahash: add memory allocation failure check

> On 23 Apr 2025, at 13:32, m.korotkov@postgrespro.ru wrote:
> 
> I found a case of potential NULL pointer dereference.
> In src/backend/utils/hash/dynahash.c in function HTAB *hash_create() the result of the DynaHashAlloc() is used unsafely.
> The function DynaHashAlloc() calls MemoryContextAllocExtended() with MCXT_ALLOC_NO_OOM and can return a NULL pointer.
> Added the pointer check for avoiding a potential problem.

Yeah, good catch.
And all HTAB->alloc() (which relies on DynaHashAlloc) callers seem to check for NULL result.
It seems there are a lot of cases of MCXT_ALLOC_NO_OOM, perhaps should we check them all?


Best regards, Andrey Borodin.