tree d4e62bd9bad83e8c613a183fed9126c6b30e301c
parent 01fbe09cb3b437d06486e6c224695038ca3ba55b
author Chengfeng Ye <cyeaa@connect.ust.hk> 1635072371 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1637923721 +0100

ALSA: gus: fix null pointer dereference on pointer block

[ Upstream commit a0d21bb3279476c777434c40d969ea88ca64f9aa ]

The pointer block return from snd_gf1_dma_next_block could be
null, so there is a potential null pointer dereference issue.
Fix this by adding a null check before dereference.

Signed-off-by: Chengfeng Ye <cyeaa@connect.ust.hk>
Link: https://lore.kernel.org/r/20211024104611.9919-1-cyeaa@connect.ust.hk
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>