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ALSA: wavefront: Proper check of get_user() error 

commit a34ae6c066 upstream.

The antient ISA wavefront driver reads its sample patch data (uploaded
over an ioctl) via __get_user() with no good reason; likely just for
some performance optimizations in the past.  Let's change this to the
standard get_user() and the error check for handling the fault case
properly.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20220510103626.16635-1-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 2022-05-10 12:36:26 +02:00 committed by Greg Kroah-Hartman
parent c1d16757bd
commit 16ffc72b0b
1 changed files with 2 additions and 1 deletions
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3
sound/isa/wavefront/wavefront_synth.c
View File

@ -1094,7 +1094,8 @@ wavefront_send_sample (snd_wavefront_t *dev,
if (dataptr < data_end) {
__get_user (sample_short, dataptr);
if (get_user(sample_short, dataptr))
return -EFAULT;
dataptr += skip;
if (data_is_unsigned) { /* GUS ? */