When booting a NUMA system with nodes that have no memory (eg by limiting memory),
bootmem_alloc_core tried to find pages in an uninitialized bootmem_map.
This caused a null pointer access.
This fix adds a check, so that NULL is returned.
That will enable the caller (bootmem_alloc_nopanic)
to alloc memory on other without a panic.
Signed-off-by: Christian Krafft <[email protected]>
Index: linux/mm/bootmem.c
===================================================================
--- linux.orig/mm/bootmem.c
+++ linux/mm/bootmem.c
@@ -196,6 +196,10 @@ __alloc_bootmem_core(struct bootmem_data
if (limit && bdata->node_boot_start >= limit)
return NULL;
+ /* on nodes without memory - bootmem_map is NULL */
+ if(!bdata->node_bootmem_map)
+ return NULL;
+
end_pfn = bdata->node_low_pfn;
limit = PFN_DOWN(limit);
if (limit && end_pfn > limit)
-
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