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ASoC: stm32: spdifrx: fix dma channel release in stm32_spdifrx_remove

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[ Upstream commit 9bb4af400c386374ab1047df44c508512c08c31f ]

In case of error when requesting ctrl_chan DMA channel, ctrl_chan is not
null. So the release of the dma channel leads to the following issue:
[    4.879000] st,stm32-spdifrx 500d0000.audio-controller:
dma_request_slave_channel error -19
[    4.888975] Unable to handle kernel NULL pointer dereference
at virtual address 000000000000003d
[...]
[    5.096577] Call trace:
[    5.099099]  dma_release_channel+0x24/0x100
[    5.103235]  stm32_spdifrx_remove+0x24/0x60 [snd_soc_stm32_spdifrx]
[    5.109494]  stm32_spdifrx_probe+0x320/0x4c4 [snd_soc_stm32_spdifrx]

To avoid this issue, release channel only if the pointer is valid.

Fixes: 794df9448edb ("ASoC: stm32: spdifrx: manage rebind issue")
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Link: https://patch.msgid.link/20241105140242.527279-1-olivier.moysan@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Amelie Delaunay 2024-11-05 15:02:42 +01:00 committed by Kreciorek
parent e9f5c9418e
commit c6abcded78
1 changed files with 1 additions and 1 deletions
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2
sound/soc/stm/stm32_spdifrx.c
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@ -948,7 +948,7 @@ static int stm32_spdifrx_remove(struct platform_device *pdev)
{
struct stm32_spdifrx_data *spdifrx = platform_get_drvdata(pdev);
if (spdifrx->ctrl_chan)
if (!IS_ERR(spdifrx->ctrl_chan))
dma_release_channel(spdifrx->ctrl_chan);
if (spdifrx->dmab)