From de4633796716b46d6dbbe6498d0af2680ee6488b Mon Sep 17 00:00:00 2001 From: Christophe JAILLET Date: Fri, 31 May 2024 07:57:53 +0000 Subject: [PATCH] tty: serial: 8250: serial_cs: Fix a memory leak in error handling path stable inclusion from stable-v4.19.198 commit cddee5c287e26f6b2ba5c0ffdfc3a846f2f10461 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9S6TL CVE: CVE-2021-47330 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=cddee5c287e26f6b2ba5c0ffdfc3a846f2f10461 -------------------------------- [ Upstream commit fad92b11047a748c996ebd6cfb164a63814eeb2e ] In the probe function, if the final 'serial_config()' fails, 'info' is leaking. Add a resource handling path to free this memory. Signed-off-by: Christophe JAILLET Link: https://lore.kernel.org/r/dc25f96b7faebf42e60fe8d02963c941cf4d8124.1621971720.git.christophe.jaillet@wanadoo.fr Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin Signed-off-by: Cai Xinchen --- drivers/tty/serial/8250/serial_cs.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/serial_cs.c b/drivers/tty/serial/8250/serial_cs.c index c8186a05a453..271c0388e00d 100644 --- a/drivers/tty/serial/8250/serial_cs.c +++ b/drivers/tty/serial/8250/serial_cs.c @@ -306,6 +306,7 @@ static int serial_resume(struct pcmcia_device *link) static int serial_probe(struct pcmcia_device *link) { struct serial_info *info; + int ret; dev_dbg(&link->dev, "serial_attach()\n"); @@ -320,7 +321,15 @@ static int serial_probe(struct pcmcia_device *link) if (do_sound) link->config_flags |= CONF_ENABLE_SPKR; - return serial_config(link); + ret = serial_config(link); + if (ret) + goto free_info; + + return 0; + +free_info: + kfree(info); + return ret; } static void serial_detach(struct pcmcia_device *link) -- Gitee