mm: cma: Fix incorrect type conversion for size during dma allocation
diff mbox series

Message ID 1444854232-4085-1-git-send-email-rvaswani@codeaurora.org
State New, archived
Headers show
Series
  • mm: cma: Fix incorrect type conversion for size during dma allocation
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Commit Message

Rohit Vaswani Oct. 14, 2015, 8:23 p.m. UTC
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(-)

Comments

Greg Kroah-Hartman Oct. 18, 2015, 5:10 a.m. UTC | #1
On Wed, Oct 14, 2015 at 01:23:51PM -0700, Rohit Vaswani wrote:
> 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>

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Patch
diff mbox series

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)