[PATCH 5.10] dmaengine: dw-edma-pcie: Reject devices without driver data

[Roman Demidov]

From: Koichiro Den <den@xxxxxxxxxxxxx>

commit 11d7cfe0c119691b2dafbb699bbca90258c678aa upstream.

dw_edma_pcie_probe() treats the PCI device ID driver_data as the
template for the controller layout and copies it unconditionally. A
device bound dynamically via sysfs can match the driver without that
data, which leads to a NULL pointer dereference.

Reject such matches before enabling the device.

Fixes: 41aaff2a2ac0 ("dmaengine: Add Synopsys eDMA IP PCIe glue-logic")
Signed-off-by: Koichiro Den <den@xxxxxxxxxxxxx>
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
Link: https://patch.msgid.link/20260521142153.2957432-3-den@xxxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Roman Demidov <roman.demidov.nn@xxxxxxxxx>
---
Backport fix for CVE-2026-72147

 drivers/dma/dw-edma/dw-edma-pcie.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c
index 987ede1087dd..95d60feca391 100644
--- a/drivers/dma/dw-edma/dw-edma-pcie.c
+++ b/drivers/dma/dw-edma/dw-edma-pcie.c
@@ -104,6 +104,9 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
 	struct dw_edma *dw;
 	int i, mask;
 
+	if (!pdata)
+		return -ENODEV;
+
 	/* Enable PCI device */
 	err = pcim_enable_device(pdev);
 	if (err) {
-- 
2.53.0