tree 924fbea929d11d1c0d2d4dfa42efba82880e13b6
parent e8ed2ff71f0899125786ac32d69a38432f3f8129
author Changming Liu <liu.changm@northeastern.edu> 1590453561 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1591165178 +0200

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

[ Upstream commit fb8cd6481ffd126f35e9e146a0dcf0c4e8899f2e ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>