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authorTakashi Iwai <tiwai@suse.de>2023-09-02 09:10:43 +0300
committerTakashi Iwai <tiwai@suse.de>2023-09-02 09:11:48 +0300
commite14ebde5df2ade7164b3adc3b8644d531a78a785 (patch)
tree7cc2f035d4748258f56952c98b79ba027a855c02 /sound
parentef98a4883298bc2ead30ade6b6a10c4ac4bc07c8 (diff)
downloadlinux-e14ebde5df2ade7164b3adc3b8644d531a78a785.tar.xz
ALSA: pcm: Fix error checks of default read/write copy ops
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: cf393babb37a ("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>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/pcm_lib.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 4859fb1caec9..a11cd7d6295f 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -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;
}