* [PATCH] stop NULL pointer dereference in __alloc_pages
@ 2002-04-18 22:38 Martin J. Bligh
0 siblings, 0 replies; only message in thread
From: Martin J. Bligh @ 2002-04-18 22:38 UTC (permalink / raw)
To: Marcelo Tosatti, Linus Torvalds; +Cc: linux-kernel
This trivial patch will apply to both 2.4.19-pre7 and 2.5.8 with just line
offsets. It stops us from following a NULL pointer in classzone in the case
where there is a pgdat without a fully populated zone list (ie a node with
no ZONE_NORMAL on an ia32 NUMA machine). Without this patch, ia32
NUMA machines won't even boot - we dereference the classzone ptr
a few lines further down (or try to ;-) ).
Please apply ...
Thanks,
Martin.
--- linux-2.4.18-memalloc/mm/page_alloc.c.old Fri Mar 8 18:21:41 2002
+++ linux-2.4.18-memalloc/mm/page_alloc.c Fri Mar 8 18:23:27 2002
@@ -317,6 +317,8 @@
zone = zonelist->zones;
classzone = *zone;
+ if (classzone == NULL)
+ return NULL;
min = 1UL << order;
for (;;) {
zone_t *z = *(zone++);
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2002-04-18 22:38 [PATCH] stop NULL pointer dereference in __alloc_pages Martin J. Bligh
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