The patch titled
Subject: dmapool: fix overflow condition in pool_find_page()
has been added to the -mm tree. Its filename is
dmapool-fix-overflow-condition-in-pool_find_page.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dmapool-fix-overflow-condition-in-pool_find_page.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dmapool-fix-overflow-condition-in-pool_find_page.patch
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------------------------------------------------------
From: Robin Murphy <robin.murphy@xxxxxxx>
Subject: dmapool: fix overflow condition in pool_find_page()
If a DMA pool lies at the very top of the dma_addr_t range (as may happen
with an IOMMU involved), the calculated end address of the pool wraps
around to zero, and page lookup always fails. Tweak the relevant
calculation to be overflow-proof.
Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: Sakari Ailus <sakari.ailus@xxxxxx>
Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/dmapool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/dmapool.c~dmapool-fix-overflow-condition-in-pool_find_page mm/dmapool.c
--- a/mm/dmapool.c~dmapool-fix-overflow-condition-in-pool_find_page
+++ a/mm/dmapool.c
@@ -394,7 +394,7 @@ static struct dma_page *pool_find_page(s
list_for_each_entry(page, &pool->page_list, page_list) {
if (dma < page->dma)
continue;
- if (dma < (page->dma + pool->allocation))
+ if ((dma - page->dma) < pool->allocation)
return page;
}
return NULL;
_
Patches currently in -mm which might be from robin.murphy@xxxxxxx are
dmapool-fix-overflow-condition-in-pool_find_page.patch
dma-mapping-tidy-up-dma_parms-default-handling.patch
dma-debug-check-nents-in-dma_sync_sg.patch
dma-debug-allow-poisoning-nonzero-allocations.patch
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