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of/irq: Fix using uninitialized variable @addr_len in API of_irq_parse_one()

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of_irq_parse_one() may use uninitialized variable @addr_len as shown below:

// @addr_len is uninitialized
int addr_len;

// This operation does not touch @addr_len if it fails.
addr = of_get_property(device, "reg", &addr_len);

// Use uninitialized @addr_len if the operation fails.
if (addr_len > sizeof(addr_buf))
	addr_len = sizeof(addr_buf);

// Check the operation result here.
if (addr)
	memcpy(addr_buf, addr, addr_len);

Fix by initializing @addr_len before the operation.

Fixes: b739dffa5d ("of/irq: Prevent device address out-of-bounds read in interrupt map walk")
Cc: stable@vger.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20241209-of_irq_fix-v1-4-782f1419c8a1@quicinc.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
This commit is contained in:
Zijun Hu 2024-12-09 21:25:02 +08:00 committed by Rob Herring (Arm)
parent fec3edc47d
commit 0f7ca6f693
1 changed files with 1 additions and 0 deletions
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drivers/of/irq.c
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@ -355,6 +355,7 @@ int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_ar
return of_irq_parse_oldworld(device, index, out_irq);
/* Get the reg property (if any) */
addr_len = 0;
addr = of_get_property(device, "reg", &addr_len);
/* Prevent out-of-bounds read in case of longer interrupt parent address size */