Messages in this thread Patch in this message | | | From | Chengfeng Ye <> | Subject | [PATCH] sound/isa/gus: fix null pointer dereference on pointer block | Date | Sun, 24 Oct 2021 03:46:11 -0700 |
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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> --- sound/isa/gus/gus_dma.c | 2 ++ 1 file changed, 2 insertions(+)
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 -- 2.17.1
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