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Commitaab30cd

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Fix memory leak on DSM slot exhaustion.
If we attempt to create a DSM segment when no slots are available,we should return the memory to the operating system. Previouslywe did that if the DSM_CREATE_NULL_IF_MAXSEGMENTS flag waspassed in, but we didn't do it if an error was raised. Repair.Back-patch to 9.4, where DSM segments arrived.Author: Thomas MunroReviewed-by: Robert HaasReported-by: Julian BackesDiscussion:https://postgr.es/m/CA%2BhUKGKAAoEw-R4om0d2YM4eqT1eGEi6%3DQot-3ceDR-SLiWVDw%40mail.gmail.com
1 parentde3d2df commitaab30cd

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1 file changed

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lines changed
  • src/backend/storage/ipc

1 file changed

+8
-9
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‎src/backend/storage/ipc/dsm.c

Lines changed: 8 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -512,17 +512,16 @@ dsm_create(Size size, int flags)
512512
/* Verify that we can support an additional mapping. */
513513
if (nitems >=dsm_control->maxitems)
514514
{
515+
LWLockRelease(DynamicSharedMemoryControlLock);
516+
dsm_impl_op(DSM_OP_DESTROY,seg->handle,0,&seg->impl_private,
517+
&seg->mapped_address,&seg->mapped_size,WARNING);
518+
if (seg->resowner!=NULL)
519+
ResourceOwnerForgetDSM(seg->resowner,seg);
520+
dlist_delete(&seg->node);
521+
pfree(seg);
522+
515523
if ((flags&DSM_CREATE_NULL_IF_MAXSEGMENTS)!=0)
516-
{
517-
LWLockRelease(DynamicSharedMemoryControlLock);
518-
dsm_impl_op(DSM_OP_DESTROY,seg->handle,0,&seg->impl_private,
519-
&seg->mapped_address,&seg->mapped_size,WARNING);
520-
if (seg->resowner!=NULL)
521-
ResourceOwnerForgetDSM(seg->resowner,seg);
522-
dlist_delete(&seg->node);
523-
pfree(seg);
524524
returnNULL;
525-
}
526525
ereport(ERROR,
527526
(errcode(ERRCODE_INSUFFICIENT_RESOURCES),
528527
errmsg("too many dynamic shared memory segments")));

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