Patch "PCI: Check for alloc failure in pci_request_irq()" has been added to the 4.19-stable tree

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This is a note to let you know that I've just added the patch titled

    PCI: Check for alloc failure in pci_request_irq()

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pci-check-for-alloc-failure-in-pci_request_irq.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 60b24c5e813b5f57ca38e27ebc10f9a437f92f91
Author: Zeng Heng <zengheng4@xxxxxxxxxx>
Date:   Mon Nov 21 10:00:29 2022 +0800

    PCI: Check for alloc failure in pci_request_irq()
    
    [ 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>

diff --git a/drivers/pci/irq.c b/drivers/pci/irq.c
index a1de501a2729..3f6a5d520259 100644
--- a/drivers/pci/irq.c
+++ b/drivers/pci/irq.c
@@ -94,6 +94,8 @@ 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);



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