[PATCH] IPMI oops fix

While doing some testing I discovered that if the BIOS on a board does not
properly setup the DMI information it leads to a panic in the IPMI code.

The panic is due to dereferencing a pointer which is not initialized.  The
pointer is initialized in port_setup() and/or mem_setup() and used in
init_one_smi() and cleanup_one_si(), however if either port_setup() or
mem_setup() return ENODEV the pointer does not get initialized.

Signed-off-by: Paolo Galtieri <pgaltieri@mvista.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 01a1f6badb53..beea450ee4b2 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2399,7 +2399,8 @@ static int init_one_smi(int intf_num, struct smi_info **smi)
                         new_smi->handlers->cleanup(new_smi->si_sm);
                 kfree(new_smi->si_sm);
         }
-        new_smi->io_cleanup(new_smi);
+        if (new_smi->io_cleanup)
+                new_smi->io_cleanup(new_smi);
 
         return rv;
 }
@@ -2518,7 +2519,8 @@ static void __exit cleanup_one_si(struct smi_info *to_clean)
 
         kfree(to_clean->si_sm);
 
-        to_clean->io_cleanup(to_clean);
+        if (to_clean->io_cleanup)
+                to_clean->io_cleanup(to_clean);
 }
 
 static __exit void cleanup_ipmi_si(void)