[tip: irq/urgent] genirq/msi: Prevent NULL pointer dereference in msi_domain_debug_show()

["tip-bot2 for Andrew Jones" <tip-bot2@linutronix.de>]

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     e6a3fc4f10b872d02e25f83227e725c79b25d893
Gitweb:        https://git.kernel.org/tip/e6a3fc4f10b872d02e25f83227e725c79b25d893
Author:        Andrew Jones <ajones@ventanamicro.com>
AuthorDate:    Wed, 30 Apr 2025 14:48:37 +02:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Wed, 30 Apr 2025 23:25:10 +02:00

genirq/msi: Prevent NULL pointer dereference in msi_domain_debug_show()

irq_domain_debug_show_one() calls msi_domain_debug_show() with a non-NULL
domain pointer and a NULL irq_data pointer. irq_debug_show_data() calls it
with a NULL domain pointer.

The domain pointer is not used, but the irq_data pointer is required to be
non-NULL and lacks a NULL pointer check.

Add the missing NULL pointer check to ensure there is a non-NULL irq_data
pointer in msi_domain_debug_show() before dereferencing it.

[ tglx: Massaged change log ]

Fixes: 01499ae673dc ("genirq/msi: Expose MSI message data in debugfs")
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250430124836.49964-2-ajones@ventanamicro.com
---
 kernel/irq/msi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
index 5c8d43c..c05ba7c 100644
--- a/kernel/irq/msi.c
+++ b/kernel/irq/msi.c
@@ -761,7 +761,7 @@ static int msi_domain_translate(struct irq_domain *domain, struct irq_fwspec *fw
 static void msi_domain_debug_show(struct seq_file *m, struct irq_domain *d,
 				  struct irq_data *irqd, int ind)
 {
-	struct msi_desc *desc = irq_data_get_msi_desc(irqd);
+	struct msi_desc *desc = irqd ? irq_data_get_msi_desc(irqd) : NULL;
 
 	if (!desc)
 		return;