netdev - [PATCH net] net: netdevsim: fix nsim_pp_hold

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Message-ID: <20241216083703.1859921-1-edumazet@google.com>
Date: Mon, 16 Dec 2024 08:37:03 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Simon Horman <horms@...nel.org>, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>, syzbot <syzkaller@...glegroups.com>
Subject: [PATCH net] net: netdevsim: fix nsim_pp_hold_write()

nsim_pp_hold_write() has two problems:

1) It may return with rtnl held, as found by syzbot.

2) Its return value does not propagate an error if any.

Fixes: 1580cbcbfe77 ("net: netdevsim: add some fake page pool use")
Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 drivers/net/netdevsim/netdev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 0be47fed4efc5664c436c91669de5d7c13ef3411..e068a9761c094e91c584d0b29a46166ec31f42d5 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -635,10 +635,10 @@ nsim_pp_hold_write(struct file *file, const char __user *data,
 		page_pool_put_full_page(ns->page->pp, ns->page, false);
 		ns->page = NULL;
 	}
-	rtnl_unlock();
 
 exit:
-	return count;
+	rtnl_unlock();
+	return ret;
 }
 
 static const struct file_operations nsim_pp_hold_fops = {
-- 
2.47.1.613.gc27f4b7a9f-goog