Re: ISSUE: 2.1.37-pre2 - NULL pointer bug in shm_swap() code

David S. Miller (davem@jenolan.rutgers.edu)
Mon, 5 May 1997 04:08:03 -0400

Date: Fri, 2 May 1997 12:21:13 +0200
From: Wolfgang Wander <wwc@lars.desy.de>

However as soon as it comes to swapping of shm the kernel oopses:

Thanks Wolfgang for the extensive debugging on this one.
The bug is my fault, please try this fix.

--- ipc/shm.c.~1~ Wed Apr 30 23:34:27 1997
+++ ipc/shm.c Mon May 5 04:05:56 1997
@@ -806,7 +806,7 @@
flush_tlb_page(shmd, tmp);
/* continue looping through circular list */
} while (0);
- if ((shmd = shmd->vm_next_share) == shp->attaches)
+ if ((shmd = shmd->vm_next_share) == NULL)
break;
}