[PATCH 6.1 0622/1146] PCI: Check for alloc failure in pci_request_irq()

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From: Zeng Heng <zengheng4@xxxxxxxxxx>

[ Upstream commit 2d9cd957d40c3ac491b358e7cff0515bb07a3a9c ]

When kvasprintf() fails to allocate memory, it returns a NULL pointer.
Return error from pci_request_irq() so we don't dereference it.

[bhelgaas: commit log]
Fixes: 704e8953d3e9 ("PCI/irq: Add pci_request_irq() and pci_free_irq() helpers")
Link: https://lore.kernel.org/r/20221121020029.3759444-1-zengheng4@xxxxxxxxxx
Signed-off-by: Zeng Heng <zengheng4@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/pci/irq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/irq.c b/drivers/pci/irq.c
index 12ecd0aaa28d..0050e8f6814e 100644
--- a/drivers/pci/irq.c
+++ b/drivers/pci/irq.c
@@ -44,6 +44,8 @@ int pci_request_irq(struct pci_dev *dev, unsigned int nr, irq_handler_t handler,
 	va_start(ap, fmt);
 	devname = kvasprintf(GFP_KERNEL, fmt, ap);
 	va_end(ap);
+	if (!devname)
+		return -ENOMEM;
 
 	ret = request_threaded_irq(pci_irq_vector(dev, nr), handler, thread_fn,
 				   irqflags, devname, dev_id);
-- 
2.35.1






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