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authorTakashi Iwai <tiwai@suse.de>2020-12-18 15:56:24 +0100
committerTakashi Iwai <tiwai@suse.de>2020-12-18 17:09:10 +0100
commit5c1733e33c888a3cb7f576564d8ad543d5ad4a9e (patch)
treed9181980f8be06caab1468ae17b72a44b67a45bc /sound
parent9df28edce7c6ab38050235f6f8b43dd7ccd01b6d (diff)
ALSA: memalloc: Align buffer allocations in page size
Currently the standard memory allocator (snd_dma_malloc_pages*()) passes the byte size to allocate as is. Most of the backends allocates real pages, hence the actual allocations are aligned in page size. However, the genalloc doesn't seem assuring the size alignment, hence it may result in the access outside the buffer when the whole memory pages are exposed via mmap. For avoiding such inconsistencies, this patch makes the allocation size always to be aligned in page size. Note that, after this change, snd_dma_buffer.bytes field contains the aligned size, not the originally requested size. This value is also used for releasing the pages in return. Reviewed-by: Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20201218145625.2045-2-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/memalloc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index 0f335162f87c..966bef5acc75 100644
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -133,6 +133,7 @@ int snd_dma_alloc_pages(int type, struct device *device, size_t size,
if (WARN_ON(!dmab))
return -ENXIO;
+ size = PAGE_ALIGN(size);
dmab->dev.type = type;
dmab->dev.dev = device;
dmab->bytes = 0;