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mm: cma: fix incorrect type conversion for size during dma allocation 

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>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rohit Vaswani 2015-10-22 13:32:11 -07:00 committed by Linus Torvalds
parent 5211613978
commit 67a2e213e7
4 changed files with 6 additions and 6 deletions
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2
drivers/base/dma-contiguous.c
View File

@ -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)

2
include/linux/cma.h
View File

@ -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

4
include/linux/dma-contiguous.h
View File

@ -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;

4
mm/cma.c
View File

@ -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)