The patch titled
Subject: DMA, CMA: fix possible memory leak
has been added to the -mm tree. Its filename is
dma-cma-fix-possible-memory-leak.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dma-cma-fix-possible-memory-leak.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dma-cma-fix-possible-memory-leak.patch
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From: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Subject: DMA, CMA: fix possible memory leak
We should free memory for bitmap when we find zone mismatch, otherwise
this memory will leak.
Additionally, I copy code comment from PPC KVM's CMA code to inform
why we need to check zone mis-match.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Acked-by: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
Reviewed-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Cc: Michal Nazarewicz <mina86@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Gleb Natapov <gleb@xxxxxxxxxx>
Cc: Alexander Graf <agraf@xxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/base/dma-contiguous.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff -puN drivers/base/dma-contiguous.c~dma-cma-fix-possible-memory-leak drivers/base/dma-contiguous.c
--- a/drivers/base/dma-contiguous.c~dma-cma-fix-possible-memory-leak
+++ a/drivers/base/dma-contiguous.c
@@ -176,14 +176,24 @@ static int __init cma_activate_area(stru
base_pfn = pfn;
for (j = pageblock_nr_pages; j; --j, pfn++) {
WARN_ON_ONCE(!pfn_valid(pfn));
+ /*
+ * alloc_contig_range requires the pfn range
+ * specified to be in the same zone. Make this
+ * simple by forcing the entire CMA resv range
+ * to be in the same zone.
+ */
if (page_zone(pfn_to_page(pfn)) != zone)
- return -EINVAL;
+ goto err;
}
init_cma_reserved_pageblock(pfn_to_page(base_pfn));
} while (--i);
mutex_init(&cma->lock);
return 0;
+
+err:
+ kfree(cma->bitmap);
+ return -EINVAL;
}
static struct cma cma_areas[MAX_CMA_AREAS];
_
Patches currently in -mm which might be from iamjoonsoo.kim@xxxxxxx are
slab-maintainer-update.patch
slab-fix-oops-when-reading-proc-slab_allocators.patch
mm-slabc-add-__init-to-init_lock_keys.patch
slab-common-add-functions-for-kmem_cache_node-access.patch
slub-use-new-node-functions.patch
slub-use-new-node-functions-fix.patch
slab-use-get_node-and-kmem_cache_node-functions.patch
slab-use-get_node-and-kmem_cache_node-functions-fix.patch
mm-slabh-wrap-the-whole-file-with-guarding-macro.patch
vmalloc-use-rcu-list-iterator-to-reduce-vmap_area_lock-contention.patch
memcg-cleanup-memcg_cache_params-refcnt-usage.patch
memcg-destroy-kmem-caches-when-last-slab-is-freed.patch
memcg-mark-caches-that-belong-to-offline-memcgs-as-dead.patch
slub-dont-fail-kmem_cache_shrink-if-slab-placement-optimization-fails.patch
slub-make-slab_free-non-preemptable.patch
memcg-wait-for-kfrees-to-finish-before-destroying-cache.patch
slub-make-dead-memcg-caches-discard-free-slabs-immediately.patch
slab-do-not-keep-free-objects-slabs-on-dead-memcg-caches.patch
dma-cma-fix-possible-memory-leak.patch
dma-cma-separate-core-cma-management-codes-from-dma-apis.patch
dma-cma-support-alignment-constraint-on-cma-region.patch
dma-cma-support-arbitrary-bitmap-granularity.patch
dma-cma-support-arbitrary-bitmap-granularity-fix.patch
cma-generalize-cma-reserved-area-management-functionality.patch
ppc-kvm-cma-use-general-cma-reserved-area-management-framework.patch
mm-cma-clean-up-cma-allocation-error-path.patch
mm-cma-change-cma_declare_contiguous-to-obey-coding-convention.patch
mm-cma-clean-up-log-message.patch
mm-compactionc-isolate_freepages_block-small-tuneup.patch
page-owners-correct-page-order-when-to-free-page.patch
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