On 2019/1/26 23:08, Corey Minyard wrote:
On Sat, Jan 26, 2019 at 05:14:54PM +0800, Yang Yingliang wrote:
When we excute the following commands, we got oops
rmmod ipmi_si
cat /proc/ioports
snip..
If io_setup is called successful in try_smi_init() but try_smi_init()
goes out_err before calling ipmi_register_smi(), so ipmi_unregister_smi()
will not be called while removing module. It leads to the resource that
allocated in io_setup() can not be freed, but the name(DEVICE_NAME) of
resource is freed while removing the module. It causes use-after-free
when cat /proc/ioports.
Fix this by calling io_cleanup() while try_smi_init() goes to out_err
and don't call release_region() if request_region() is not called to
avoid error prints.
Fixes: 93c303d2045b ("ipmi_si: Clean up shutdown a bit")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: NuoHan Qiao <qiaonuohan@xxxxxxxxxx>
Suggested-by: Corey Minyard <cminyard@xxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
drivers/char/ipmi/ipmi_si_intf.c | 5 +++++
drivers/char/ipmi/ipmi_si_port_io.c | 3 +++
2 files changed, 8 insertions(+)
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index dc8603d..f1b9fda 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2085,6 +2085,11 @@ static int try_smi_init(struct smi_info *new_smi)
WARN_ON(new_smi->io.dev->init_name != NULL);
out_err:
+ if (rv && new_smi->io.io_cleanup) {
+ new_smi->io.io_cleanup(&new_smi->io);
+ new_smi->io.io_cleanup = NULL;
+ }
+
kfree(init_name);
return rv;
}
diff --git a/drivers/char/ipmi/ipmi_si_port_io.c b/drivers/char/ipmi/ipmi_si_port_io.c
index ef6dffc..0c46a3f 100644
--- a/drivers/char/ipmi/ipmi_si_port_io.c
+++ b/drivers/char/ipmi/ipmi_si_port_io.c
@@ -53,6 +53,9 @@ static void port_cleanup(struct si_sm_io *io)
unsigned int addr = io->addr_data;
int idx;
+ if (io->regsize != 1 && io->regsize != 2 && io->regsize != 4)
+ return;
+
Why do you need this part? I can't see the reason for it. The addr
part below should handle that, especially with the above change.
-corey
If ipmi_si_port_setup() returns in default case, request_region() won't
be called,
so we don't need to call release_region() or it will prints some warning
messages like
this "Trying to free nonexistent resource...".
We don't need call io_cleanup() until the io_setup() returns successful.
How about change this part like this:
diff --git a/drivers/char/ipmi/ipmi_si_port_io.c
b/drivers/char/ipmi/ipmi_si_port_io.c
index ef6dffc..03924c3 100644
--- a/drivers/char/ipmi/ipmi_si_port_io.c
+++ b/drivers/char/ipmi/ipmi_si_port_io.c
@@ -68,8 +68,6 @@ int ipmi_si_port_setup(struct si_sm_io *io)
if (!addr)
return -ENODEV;
- io->io_cleanup = port_cleanup;
-
/*
* Figure out the actual inb/inw/inl/etc routine to use based
* upon the register size.
@@ -109,5 +107,8 @@ int ipmi_si_port_setup(struct si_sm_io *io)
return -EIO;
}
}
+
+ io->io_cleanup = port_cleanup;
+
return 0;
}
Thanks,
Yang
if (addr) {
for (idx = 0; idx < io->io_size; idx++)
release_region(addr + idx * io->regspacing,
--
1.8.3
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