From: Dan Carpenter error27@gmail.com
commit a92ce570c81dc0feaeb12a429b4bc65686d17967 upstream.
The intf_free() function frees the "intf" pointer so we cannot dereference it again on the next line.
Fixes: cbb79863fc31 ("ipmi: Don't allow device module unload when in use") Signed-off-by: Dan Carpenter error27@gmail.com Message-Id: Y3M8xa1drZv4CToE@kili Cc: stable@vger.kernel.org # 5.5+ Signed-off-by: Corey Minyard cminyard@mvista.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/char/ipmi/ipmi_msghandler.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/char/ipmi/ipmi_msghandler.c +++ b/drivers/char/ipmi/ipmi_msghandler.c @@ -1298,6 +1298,7 @@ static void _ipmi_destroy_user(struct ip unsigned long flags; struct cmd_rcvr *rcvr; struct cmd_rcvr *rcvrs = NULL; + struct module *owner;
if (!acquire_ipmi_user(user, &i)) { /* @@ -1358,8 +1359,9 @@ static void _ipmi_destroy_user(struct ip kfree(rcvr); }
+ owner = intf->owner; kref_put(&intf->refcount, intf_free); - module_put(intf->owner); + module_put(owner); }
int ipmi_destroy_user(struct ipmi_user *user)