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ALSA: hwdep: fix a left shifting 1 by 31 UB bug 

The "info.index" variable can be 31 in "1 << info.index".
This might trigger an undefined behavior since 1 is signed.

Fix this by casting 1 to 1u just to be sure "1u << 31" is defined.

Signed-off-by: Changming Liu <liu.changm@northeastern.edu>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/BL0PR06MB4548170B842CB055C9AF695DE5B00@BL0PR06MB4548.namprd06.prod.outlook.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Changming Liu 2020-05-26 00:39:21 +00:00 committed by Takashi Iwai
parent 259eb82475
commit fb8cd6481f
1 changed files with 2 additions and 2 deletions
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4
sound/core/hwdep.c
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@ -216,12 +216,12 @@ static int snd_hwdep_dsp_load(struct snd_hwdep *hw,
if (info.index >= 32)
return -EINVAL;
/* check whether the dsp was already loaded */
if (hw->dsp_loaded & (1 << info.index))
if (hw->dsp_loaded & (1u << info.index))
return -EBUSY;
err = hw->ops.dsp_load(hw, &info);
if (err < 0)
return err;
hw->dsp_loaded |= (1 << info.index);
hw->dsp_loaded |= (1u << info.index);
return 0;
}