6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
[ 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@xxxxxxxxxxx>
Signed-off-by: Olivier Moysan <olivier.moysan@xxxxxxxxxxx>
Link: https://patch.msgid.link/20241105140242.527279-1-olivier.moysan@xxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
sound/soc/stm/stm32_spdifrx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sound/soc/stm/stm32_spdifrx.c b/sound/soc/stm/stm32_spdifrx.c
index a359b528b26b7..4e17909d21267 100644
--- a/sound/soc/stm/stm32_spdifrx.c
+++ b/sound/soc/stm/stm32_spdifrx.c
@@ -943,7 +943,7 @@ static void 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)
--
2.43.0
