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Message-ID: <1a21fffe403d7181e0404db1ed92140c306f97b7.1713270624.git.pnewman@connecttech.com>
Date: Tue, 16 Apr 2024 08:55:35 -0400
From: Parker Newman <parker@...est.io>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
linux-kernel@...r.kernel.org,
linux-serial@...r.kernel.org
Cc: Parker Newman <pnewman@...necttech.com>
Subject: [PATCH v3 8/8] serial: exar: fix: fix crash during shutdown if setup fails
From: Parker Newman <pnewman@...necttech.com>
If a port fails to register with serial8250_register_8250_port() the
kernel can crash when shutting down or module removal.
This is because "priv->line[i]" will be set to a negative error code
and in the exar_pci_remove() function serial8250_unregister_port() is
called without checking if the "priv->line[i]" value is valid.
Signed-off-by: Parker Newman <pnewman@...necttech.com>
---
drivers/tty/serial/8250/8250_exar.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index 501b9f3e9c89..f5a395ed69d1 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -1671,7 +1671,8 @@ static void exar_pci_remove(struct pci_dev *pcidev)
unsigned int i;
for (i = 0; i < priv->nr; i++)
- serial8250_unregister_port(priv->line[i]);
+ if (priv->line[i] >= 0)
+ serial8250_unregister_port(priv->line[i]);
/* Ensure that every init quirk is properly torn down */
if (priv->board->exit)
--
2.43.2
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