From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: Andrew Morton <akpm@linux-foundation.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Michal Nazarewicz <mina86@mina86.com>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
kvm@vger.kernel.org, linux-mm@kvack.org,
Gleb Natapov <gleb@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alexander Graf <agraf@suse.de>,
kvm-ppc@vger.kernel.org, linux-kernel@vger.kernel.org,
Minchan Kim <minchan@kernel.org>,
Paul Mackerras <paulus@samba.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Zhang Yanfei <zhangyanfei@cn.fujitsu.com>,
linuxppc-dev@lists.ozlabs.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 -next 1/9] DMA, CMA: fix possible memory leak
Date: Mon, 16 Jun 2014 14:40:43 +0900 [thread overview]
Message-ID: <1402897251-23639-2-git-send-email-iamjoonsoo.kim@lge.com> (raw)
In-Reply-To: <1402897251-23639-1-git-send-email-iamjoonsoo.kim@lge.com>
We should free memory for bitmap when we find zone mis-match,
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.
* Note
Minchan suggested to add a tag for the stable, but, I don't do it,
because I found this possibility during code-review and, IMO,
this patch isn't suitable for stable tree.
Acked-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Reviewed-by: Michal Nazarewicz <mina86@mina86.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 83969f8..6467c91 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -176,14 +176,24 @@ static int __init cma_activate_area(struct cma *cma)
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];
--
1.7.9.5
next prev parent reply other threads:[~2014-06-16 5:36 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-16 5:40 [PATCH v3 -next 0/9] CMA: generalize CMA reserved area management code Joonsoo Kim
2014-06-16 5:40 ` Joonsoo Kim [this message]
2014-06-16 6:27 ` [PATCH v3 -next 1/9] DMA, CMA: fix possible memory leak Minchan Kim
2014-06-17 1:33 ` Joonsoo Kim
2014-06-16 5:40 ` [PATCH v3 -next 2/9] DMA, CMA: separate core CMA management codes from DMA APIs Joonsoo Kim
2014-06-16 5:40 ` [PATCH v3 -next 3/9] DMA, CMA: support alignment constraint on CMA region Joonsoo Kim
2014-06-16 5:40 ` [PATCH v3 -next 4/9] DMA, CMA: support arbitrary bitmap granularity Joonsoo Kim
2014-06-18 20:48 ` Andrew Morton
2014-06-19 8:18 ` Joonsoo Kim
2014-06-16 5:40 ` [PATCH v3 -next 5/9] CMA: generalize CMA reserved area management functionality Joonsoo Kim
2014-07-17 8:52 ` Marek Szyprowski
2014-07-17 9:36 ` [PATCH] CMA: generalize CMA reserved area management functionality (fixup) Marek Szyprowski
2014-07-17 22:06 ` Andrew Morton
2014-07-18 7:33 ` Marek Szyprowski
2014-06-16 5:40 ` [PATCH v3 -next 6/9] PPC, KVM, CMA: use general CMA reserved area management framework Joonsoo Kim
2014-06-16 5:40 ` [PATCH v3 -next 7/9] mm, CMA: clean-up CMA allocation error path Joonsoo Kim
2014-06-16 5:40 ` [PATCH v3 -next 8/9] mm, CMA: change cma_declare_contiguous() to obey coding convention Joonsoo Kim
2014-06-16 5:40 ` [PATCH v3 -next 9/9] mm, CMA: clean-up log message Joonsoo Kim
2014-06-16 9:11 ` [PATCH v3 -next 0/9] CMA: generalize CMA reserved area management code Marek Szyprowski
2014-06-17 1:25 ` Joonsoo Kim
2014-06-18 20:51 ` Andrew Morton
2014-06-24 7:52 ` Joonsoo Kim
2014-06-25 12:33 ` Marek Szyprowski
2014-06-25 20:04 ` Andrew Morton
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