From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Chengfeng Ye <cyeaa@connect.ust.hk>, Takashi Iwai <tiwai@suse.de>,
Sasha Levin <sashal@kernel.org>,
perex@perex.cz, tiwai@suse.com, alsa-devel@alsa-project.org
Subject: [PATCH AUTOSEL 5.4 29/30] ALSA: gus: fix null pointer dereference on pointer block
Date: Tue, 9 Nov 2021 17:22:23 -0500 [thread overview]
Message-ID: <20211109222224.1235388-29-sashal@kernel.org> (raw)
In-Reply-To: <20211109222224.1235388-1-sashal@kernel.org>
From: Chengfeng Ye <cyeaa@connect.ust.hk>
[ 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>
---
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 a1c770d826dda..6d664dd8dde0b 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
--
2.33.0
next prev parent reply other threads:[~2021-11-09 22:37 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-09 22:21 [PATCH AUTOSEL 5.4 01/30] arm64: zynqmp: Do not duplicate flash partition label property Sasha Levin
2021-11-09 22:21 ` [PATCH AUTOSEL 5.4 02/30] arm64: zynqmp: Fix serial compatible string Sasha Levin
2021-11-09 22:21 ` [PATCH AUTOSEL 5.4 03/30] ARM: dts: NSP: Fix mpcore, mmc node names Sasha Levin
2021-11-09 22:21 ` [PATCH AUTOSEL 5.4 04/30] scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq() Sasha Levin
2021-11-09 22:21 ` [PATCH AUTOSEL 5.4 05/30] arm64: dts: hisilicon: fix arm,sp805 compatible string Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 06/30] arm64: dts: rockchip: add Coresight debug range for RK3399 Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 07/30] RDMA/bnxt_re: Check if the vlan is valid before reporting Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 08/30] usb: musb: tusb6010: check return value after calling platform_get_resource() Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 09/30] usb: typec: tipd: Remove WARN_ON in tps6598x_block_read Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 10/30] arm64: dts: qcom: msm8998: Fix CPU/L2 idle state latency and residency Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 11/30] arm64: dts: qcom: msm8916: Add unit name for /soc node Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 12/30] arm64: dts: freescale: fix arm,sp805 compatible string Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 13/30] ASoC: SOF: Intel: hda-dai: fix potential locking issue Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 14/30] clk: imx: imx6ul: Move csi_sel mux to correct base register Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 15/30] ASoC: nau8824: Add DMI quirk mechanism for active-high jack-detect Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 16/30] scsi: advansys: Fix kernel pointer leak Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 17/30] firmware_loader: fix pre-allocated buf built-in firmware use Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 18/30] ARM: dts: omap: fix gpmc,mux-add-data type Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 19/30] usb: host: ohci-tmio: check return value after calling platform_get_resource() Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 20/30] ARM: dts: ls1021a: move thermal-zones node out of soc/ Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 21/30] ARM: dts: ls1021a-tsn: use generic "jedec,spi-nor" compatible for flash Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 22/30] ALSA: ISA: not for M68K Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 23/30] tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 24/30] MIPS: sni: Fix the build Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 25/30] scsi: target: Fix ordered tag handling Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 26/30] scsi: target: Fix alua_tg_pt_gps_count tracking Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 27/30] iio: imu: st_lsm6dsx: Avoid potential array overflow in st_lsm6dsx_set_odr() Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 28/30] powerpc/5200: dts: fix memory node unit name Sasha Levin
2021-11-09 22:22 ` Sasha Levin [this message]
2021-11-09 22:22 ` [PATCH AUTOSEL 5.4 30/30] powerpc/dcr: Use cmplwi instead of 3-argument cmpli Sasha Levin
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