[PATCH] net: ti: icssg-prueth-sr1: Fix device_node refcount leak in prueth_probe()

[PATCH] net: ti: icssg-prueth-sr1: Fix device_node refcount leak in prueth_probe()

[laixiangwu]

prueth_probe() takes references on the eth0_node/eth1_node device nodes
with of_node_get() and stores them in prueth->eth_node[]. If either of
the "ti,mii-g-rt" or "ti,mii-rt" syscon regmap lookups fails, probe()
returns -ENODEV without dropping those references, leaking the device
nodes.

Jump to the existing put_cores label so the error path releases the
eth0_node/eth1_node references like all the other failure paths in the
function do.

Fixes: e654b85a693e ("net: ti: icssg-prueth: Add ICSSG Ethernet driver for AM65x SR1.0 platforms")
Signed-off-by: laixiangwu <laixiangwu@cmss.chinamobile.com>
---
 drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
index b8115ca47..ef1dc32ff 100644
--- a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
+++ b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c
@@ -963,13 +963,15 @@ static int prueth_probe(struct platform_device *pdev)
 	prueth->miig_rt = syscon_regmap_lookup_by_phandle(np, "ti,mii-g-rt");
 	if (IS_ERR(prueth->miig_rt)) {
 		dev_err(dev, "couldn't get ti,mii-g-rt syscon regmap\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto put_cores;
 	}
 
 	prueth->mii_rt = syscon_regmap_lookup_by_phandle(np, "ti,mii-rt");
 	if (IS_ERR(prueth->mii_rt)) {
 		dev_err(dev, "couldn't get ti,mii-rt syscon regmap\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto put_cores;
 	}
 
 	if (eth0_node) {

Re: [PATCH] net: ti: icssg-prueth-sr1: Fix device_node refcount leak in prueth_probe()

[netdev-bot+sinfo]

Hi!

This is an automated message. This series looks like a fix, but its
commit messages seem to be missing some information:

 - How the issue was discovered, e.g. hit in production, hit during
   development, syzbot report, manual code inspection, LLM or static
   analysis tool scan.

 - Whether the issue was actually triggered, or is only theoretical
   (e.g. found by code inspection). If it was triggered please include
   the symptoms, like the stack trace or error messages.

 - What hardware the change was tested on. For driver fixes please
   mention the device (and if relevant firmware version) used for
   testing, or say that the change was not tested on real hardware.

Please do not repost the series just to address the above. Instead,
reply to this email with the missing information, so that reviewers
can take it into account. If the series needs another revision for
other reasons, please include the information in the commit messages
then.

The evaluation is done by an LLM so it may be wrong, if you think
that is the case please reply and explain.