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of/irq: Fix device node refcount leakages in of_irq_count()

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commit bbf71f44aaf241d853759a71de7e7ebcdb89be3d upstream.

of_irq_count() invokes of_irq_parse_one() to count IRQs, and successful
invocation of the later will get device node @irq.np refcount, but the
former does not put the refcount before next iteration invocation, hence
causes device node refcount leakages.

Fix by putting @irq.np refcount before the next iteration invocation.

Fixes: 3da5278727 ("of/irq: Rework of_irq_count()")
Cc: stable@vger.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20250209-of_irq_fix-v2-5-93e3a2659aa7@quicinc.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zijun Hu 2025-02-09 20:58:58 +08:00 • committed by Greg Kroah-Hartman
commit 80a8ad35e2
1 changed files with 3 additions and 1 deletions
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4
drivers/of/irq.c
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@ -443,8 +443,10 @@ int of_irq_count(struct device_node *dev)
struct of_phandle_args irq;
int nr = 0;
while (of_irq_parse_one(dev, nr, &irq) == 0)
while (of_irq_parse_one(dev, nr, &irq) == 0) {
of_node_put(irq.np);
nr++;
}
return nr;
}