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Message-Id: <20240419191438.30724-1-aha310510@gmail.com>
Date: Sat, 20 Apr 2024 04:14:38 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+8e03da5d64bc85098811@...kaller.appspotmail.com
Cc: ajk@...nets.uni-bremen.de,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
linux-hams@...r.kernel.org,
linux-kernel@...r.kernel.org,
netdev@...r.kernel.org,
pabeni@...hat.com,
syzkaller-bugs@...glegroups.com,
Jeongjun Park <aha310510@...il.com>
Subject: [PATCH net,v3] net: hams: Fix deadlock caused by unsafe-irq lock in sp_get()
read_lock() present in sp_get() is interrupt-vulnerable, so the function needs to be modified.
Reported-by: syzbot+8e03da5d64bc85098811@...kaller.appspotmail.com
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Jeongjun Park <aha310510@...il.com>
---
drivers/net/hamradio/6pack.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
index 6ed38a3cdd73..fee583b1e59a 100644
--- a/drivers/net/hamradio/6pack.c
+++ b/drivers/net/hamradio/6pack.c
@@ -373,11 +373,11 @@ static struct sixpack *sp_get(struct tty_struct *tty)
{
struct sixpack *sp;
- read_lock(&disc_data_lock);
+ read_lock_irq(&disc_data_lock);
sp = tty->disc_data;
if (sp)
refcount_inc(&sp->refcnt);
- read_unlock(&disc_data_lock);
+ read_unlock_irq(&disc_data_lock);
return sp;
}
--
2.34.1
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