[PATCH 2.5.41] trap in __release_resource

From: David Kleikamp (shaggy@austin.ibm.com)
Date: Wed Oct 09 2002 - 12:19:11 EST


Russell,
I was getting a NULL pointer dereference in __release_resource when I tried
to boot 2.5.41. I traced it down to your recent patch to 8250.c. Since
the call to serial8250_request_std_resource() is now conditional, the call
to release_resource() needs to be conditional as well. This patch fixes
the problem. It looks obviously correct to me, but I don't know this code
at all.

Thanks,
Shaggy

diff -Nur linux-2.5.41/drivers/serial/8250.c linux/drivers/serial/8250.c
--- linux-2.5.41/drivers/serial/8250.c Wed Oct 9 11:16:52 2002
+++ linux/drivers/serial/8250.c Wed Oct 9 11:17:19 2002
@@ -1636,7 +1636,7 @@
         if (up->port.type != PORT_RSA && res_rsa)
                 release_resource(res_rsa);
 
- if (up->port.type == PORT_UNKNOWN)
+ if (up->port.type == PORT_UNKNOWN && res_std)
                 release_resource(res_std);
 }
 
-
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