Commit d8e89b47 authored Sep 22, 2011 by Russell King

ARM: dma-mapping: free allocated page if unable to map



If the attempt to map a page for DMA fails (eg, because we're out of
mapping space) then we must not hold on to the page we allocated for
DMA - doing so will result in a memory leak.

Cc: <stable@kernel.org>
Reported-by: Bryan Phillippe <bp@darkforest.org>
Tested-by: Bryan Phillippe <bp@darkforest.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 6760b109

arch/arm/mm/dma-mapping.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -324,6 +324,8 @@ __dma_alloc(struct device dev, size_t size, dma_addr_t handle, gfp_t gfp,

		if (addr)
		*handle = pfn_to_dma(dev, page_to_pfn(page));
		else
		__dma_free_buffer(page, size);

		return addr;
		}