From: Rohit Vaswani <rvaswani@codeaurora.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Rohit Vaswani <rvaswani@codeaurora.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH] mm: cma: Fix incorrect type conversion for size during dma allocation
Date: Wed, 14 Oct 2015 13:23:51 -0700 [thread overview]
Message-ID: <1444854232-4085-1-git-send-email-rvaswani@codeaurora.org> (raw)
This was found during userspace fuzzing test when a large size
dma cma allocation is made by driver(like ion) through userspace.
show_stack+0x10/0x1c
dump_stack+0x74/0xc8
kasan_report_error+0x2b0/0x408
kasan_report+0x34/0x40
__asan_storeN+0x15c/0x168
memset+0x20/0x44
__dma_alloc_coherent+0x114/0x18c
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
---
drivers/base/dma-contiguous.c | 2 +-
include/linux/cma.h | 2 +-
include/linux/dma-contiguous.h | 4 ++--
mm/cma.c | 4 ++--
4 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 950fff9..a12ff98 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -187,7 +187,7 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
* global one. Requires architecture specific dev_get_cma_area() helper
* function.
*/
-struct page *dma_alloc_from_contiguous(struct device *dev, int count,
+struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
unsigned int align)
{
if (align > CONFIG_CMA_ALIGNMENT)
diff --git a/include/linux/cma.h b/include/linux/cma.h
index f7ef093..29f9e77 100644
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -26,6 +26,6 @@ extern int __init cma_declare_contiguous(phys_addr_t base,
extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
unsigned int order_per_bit,
struct cma **res_cma);
-extern struct page *cma_alloc(struct cma *cma, unsigned int count, unsigned int align);
+extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align);
extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
#endif
diff --git a/include/linux/dma-contiguous.h b/include/linux/dma-contiguous.h
index 569bbd0..fec734d 100644
--- a/include/linux/dma-contiguous.h
+++ b/include/linux/dma-contiguous.h
@@ -111,7 +111,7 @@ static inline int dma_declare_contiguous(struct device *dev, phys_addr_t size,
return ret;
}
-struct page *dma_alloc_from_contiguous(struct device *dev, int count,
+struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
unsigned int order);
bool dma_release_from_contiguous(struct device *dev, struct page *pages,
int count);
@@ -144,7 +144,7 @@ int dma_declare_contiguous(struct device *dev, phys_addr_t size,
}
static inline
-struct page *dma_alloc_from_contiguous(struct device *dev, int count,
+struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
unsigned int order)
{
return NULL;
diff --git a/mm/cma.c b/mm/cma.c
index e7d1db5..4eb56bad 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -361,7 +361,7 @@ err:
* This function allocates part of contiguous memory on specific
* contiguous memory area.
*/
-struct page *cma_alloc(struct cma *cma, unsigned int count, unsigned int align)
+struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align)
{
unsigned long mask, offset, pfn, start = 0;
unsigned long bitmap_maxno, bitmap_no, bitmap_count;
@@ -371,7 +371,7 @@ struct page *cma_alloc(struct cma *cma, unsigned int count, unsigned int align)
if (!cma || !cma->count)
return NULL;
- pr_debug("%s(cma %p, count %d, align %d)\n", __func__, (void *)cma,
+ pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma,
count, align);
if (!count)
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
next reply other threads:[~2015-10-14 20:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-14 20:23 Rohit Vaswani [this message]
2015-10-18 5:10 ` [PATCH] mm: cma: Fix incorrect type conversion for size during dma allocation Greg Kroah-Hartman
-- strict thread matches above, loose matches on Subject: below --
2015-10-13 0:00 Rohit Vaswani
2015-10-13 2:11 ` Greg Kroah-Hartman
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