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bootmem: avoid freeing to bootmem after bootmem is done

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Bootmem isn't popular any more, but some architectures still use it, and
freeing to bootmem after calling free_all_bootmem_core() can end up
scribbling over random memory.  Instead, make sure the kernel generates
a warning in this case by ensuring the node_bootmem_map field is
non-NULL when are freeing or marking bootmem.

An instance of this bug was just fixed in the tile architecture ("tile:
use free_bootmem_late() for initrd") and catching this case more widely
seems like a good thing.

Signed-off-by: Chris Metcalf <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: Yasuaki Ishimatsu <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Paul McQuade <[email protected]>
Cc: Tang Chen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Chris Metcalf 2015-09-08 15:02:12 -07:00 • committed by Linus Torvalds
commit 1b4ace4141
1 changed files with 7 additions and 0 deletions
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7
mm/bootmem.c
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@ -236,6 +236,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
count += pages;
while (pages--)
__free_pages_bootmem(page++, cur++, 0);
bdata->node_bootmem_map = NULL;
bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
@ -294,6 +295,9 @@ static void __init __free(bootmem_data_t *bdata,
sidx + bdata->node_min_pfn,
eidx + bdata->node_min_pfn);
if (WARN_ON(bdata->node_bootmem_map == NULL))
return;
if (bdata->hint_idx > sidx)
bdata->hint_idx = sidx;
@ -314,6 +318,9 @@ static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
eidx + bdata->node_min_pfn,
flags);
if (WARN_ON(bdata->node_bootmem_map == NULL))
return 0;
for (idx = sidx; idx < eidx; idx++)
if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
if (exclusive) {