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ALSA: pcm: Fix error checks of default read/write copy ops

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copy_from/to_iter() returns the actually copied bytes, and the more
correct check should be to compare with the given bytes, instead of
zero-check.

Fixes: cf393babb3 ("ALSA: pcm: Add copy ops with iov_iter")
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Closes: https://lore.kernel.org/r/20230902053044.GJ3390869@ZenIV
Link: https://lore.kernel.org/r/20230902061044.19366-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-09-02 08:10:43 +02:00
parent ef98a48832
commit e14ebde5df
1 changed files with 4 additions and 4 deletions
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8
sound/core/pcm_lib.c
View file

@ -1992,8 +1992,8 @@ static int default_write_copy(struct snd_pcm_substream *substream,
int channel, unsigned long hwoff,
struct iov_iter *iter, unsigned long bytes)
{
if (!copy_from_iter(get_dma_ptr(substream->runtime, channel, hwoff),
bytes, iter))
if (copy_from_iter(get_dma_ptr(substream->runtime, channel, hwoff),
bytes, iter) != bytes)
return -EFAULT;
return 0;
}
@ -2025,8 +2025,8 @@ static int default_read_copy(struct snd_pcm_substream *substream,
int channel, unsigned long hwoff,
struct iov_iter *iter, unsigned long bytes)
{
if (!copy_to_iter(get_dma_ptr(substream->runtime, channel, hwoff),
bytes, iter))
if (copy_to_iter(get_dma_ptr(substream->runtime, channel, hwoff),
bytes, iter) != bytes)
return -EFAULT;
return 0;
}