5.4-stable review patch. If anyone has any objections, please let me know.
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From: Zijun Hu quic_zijuhu@quicinc.com
commit 0f7ca6f69354e0c3923bbc28c92d0ecab4d50a3e upstream.
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: b739dffa5d57 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/of/irq.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/of/irq.c +++ b/drivers/of/irq.c @@ -298,6 +298,7 @@ int of_irq_parse_one(struct device_node 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 */