diff options
| author | Changming Liu | 2020-05-26 00:39:21 +0000 |
|---|---|---|
| committer | Takashi Iwai | 2020-05-26 08:18:24 +0200 |
| commit | fb8cd6481ffd126f35e9e146a0dcf0c4e8899f2e (patch) | |
| tree | 11ad21509a11fbbde361a819ad867e7d54531236 | |
| parent | 259eb82475316672a5d682a94dc8bdd53cf8d8c3 (diff) | |
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>
| -rw-r--r-- | sound/core/hwdep.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c index b412d3b3d5ff..21edb8ac95eb 100644 --- a/sound/core/hwdep.c +++ b/sound/core/hwdep.c @@ -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; } |