From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: dan-eli@mail.ru
Subject: BUG #18786: Pointer bmr.rel, dereferenced by passing as 1st parameter to function is checked for NULL later
Date: Tue, 28 Jan 2025 14:08:55 +0000
Message-ID: <18786-d53753af98dc9475@postgresql.org> (raw)
The following bug has been logged on the website:
Bug reference: 18786
Logged by: Daniel Elishakov
Email address: dan-eli@mail.ru
PostgreSQL version: 16.6
Operating system: ubuntu 20.04
Description:
I suggest the following patch to fix this issue
@@ -1872,7 +1872,7 @@ ExtendBufferedRelShared(BufferManagerRelation bmr,
* Note that another backend might have extended the relation by the
time
* we get the lock.
*/
- if (!(flags & EB_SKIP_EXTENSION_LOCK))
+ if (!(flags & EB_SKIP_EXTENSION_LOCK) && bmr.rel != NULL)
{
LockRelationForExtension(bmr.rel, ExclusiveLock);
if (bmr.rel)
the problem is the same as in bug-report #18785
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To: pgsql-bugs@postgresql.org
Cc: noreply@postgresql.org, pgsql-bugs@lists.postgresql.org, dan-eli@mail.ru
Subject: Re: BUG #18786: Pointer bmr.rel, dereferenced by passing as 1st parameter to function is checked for NULL later
In-Reply-To: <18786-d53753af98dc9475@postgresql.org>
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