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ASoC: max9759: fix underflow in speaker_gain_control_put()
authorDan Carpenter <dan.carpenter@oracle.com>
Wed, 19 Jan 2022 12:31:01 +0000 (15:31 +0300)
committerMark Brown <broonie@kernel.org>
Wed, 19 Jan 2022 16:47:36 +0000 (16:47 +0000)
commitb0bb84674e8b74892337d8a6c05ba312e8877bdf
tree46728b53188c7d1e8c64c058aaad02bc0a5e6fadtree | snapshot
parent9586634242b9d49ddb5102ced2f13abc165b443ecommit | diff
ASoC: max9759: fix underflow in speaker_gain_control_put()

Check for negative values of "priv->gain" to prevent an out of bounds
access.  The concern is that these might come from the user via:
  -> snd_ctl_elem_write_user()
    -> snd_ctl_elem_write()
      -> kctl->put()

Fixes: abd467dcc495 ("ASoC: max9759: Add Amplifier Driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220119123101.GA9509@kili
Signed-off-by: Mark Brown <broonie@kernel.org>
sound/soc/codecs/max9759.c diff | blob | history
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