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| author | Chengfeng Ye <cyeaa@connect.ust.hk> | 2021-10-24 03:46:11 -0700 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-10-26 08:02:16 +0200 |
| commit | a0d21bb3279476c777434c40d969ea88ca64f9aa (patch) | |
| tree | a710bb3a32acc98345c92374c5aa9bb4dcfd747c /sound/isa | |
| parent | f917c04fac45b70ff38633675f86ab4b51782205 (diff) | |
| download | linux-a0d21bb3279476c777434c40d969ea88ca64f9aa.tar.gz linux-a0d21bb3279476c777434c40d969ea88ca64f9aa.tar.bz2 linux-a0d21bb3279476c777434c40d969ea88ca64f9aa.zip | |
ALSA: gus: fix null pointer dereference on pointer block
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>
Diffstat (limited to 'sound/isa')
| -rw-r--r-- | sound/isa/gus/gus_dma.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/isa/gus/gus_dma.c b/sound/isa/gus/gus_dma.c index a1c770d826dd..6d664dd8dde0 100644 --- a/sound/isa/gus/gus_dma.c +++ b/sound/isa/gus/gus_dma.c @@ -126,6 +126,8 @@ static void snd_gf1_dma_interrupt(struct snd_gus_card * gus) } block = snd_gf1_dma_next_block(gus); spin_unlock(&gus->dma_lock); + if (!block) + return; snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd); kfree(block); #if 0 |