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ALSA: PCM: Fix NULL dereference at mmap checks

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commit 8e537d5dec upstream.

The recent refactoring of mmap handling caused Oops on some devices
that don't use the standard memory allocations.  This patch addresses
it by allowing snd_dma_buffer_mmap() helper to receive the NULL
pointer dmab argument (and return an error appropriately).

Fixes: a202bd1ad8 ("ALSA: core: Move mmap handler into memalloc ops")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20211107163911.13534-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai
2021-11-07 17:39:11 +01:00
committed by Greg Kroah-Hartman
parent b9d4a89935
commit 47047ae0b7
1 changed files with 4 additions and 1 deletions
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5
sound/core/memalloc.c
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@@ -176,8 +176,11 @@ EXPORT_SYMBOL_GPL(snd_devm_alloc_pages);
int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
struct vm_area_struct *area)
{
const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
const struct snd_malloc_ops *ops;
if (!dmab)
return -ENOENT;
ops = snd_dma_get_ops(dmab);
if (ops && ops->mmap)
return ops->mmap(dmab, area);
else