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

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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 <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rohit Vaswani 2015-10-22 13:32:11 -07:00 • committed by Linus Torvalds
commit 67a2e213e7
4 changed files with 6 additions and 6 deletions
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4
mm/cma.c
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@ -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)