ARM: dma-mapping: free allocated page if unable to map
commit d8e89b47e00ee80e920761145144640aac4cf71a upstream.
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.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 82a093c..f96d2c7 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -322,6 +322,8 @@
if (addr)
*handle = pfn_to_dma(dev, page_to_pfn(page));
+ else
+ __dma_free_buffer(page, size);
return addr;
}