Reenabled linux-xen, added patches for Xen Kernel Version 2.6.27.31,

[people/pmueller/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.fixes / grab-swap-token-oops

diff --git a/src/patches/suse-2.6.27.31/patches.fixes/grab-swap-token-oops b/src/patches/suse-2.6.27.31/patches.fixes/grab-swap-token-oops
new file mode 100644 (file)
index 0000000..fdc3b38
--- /dev/null
+++ b/src/patches/suse-2.6.27.31/patches.fixes/grab-swap-token-oops
@@ -0,0 +1,29 @@
+From: Dean Roe <roe@sgi.com>
+Subject: Prevent NULL pointer deref in grab_swap_token
+References: 159260
+
+grab_swap_token() assumes that the current process has an mm struct,
+which is not true for kernel threads invoking get_user_pages().  Since
+this should be extremely rare, just return from grab_swap_token()
+without doing anything.
+
+Signed-off-by: Dean Roe <roe@sgi.com>
+Acked-by: mason@suse.de
+Acked-by: okir@suse.de
+
+
+ mm/thrash.c |    3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/mm/thrash.c
++++ b/mm/thrash.c
+@@ -31,6 +31,9 @@ void grab_swap_token(void)
+       int current_interval;
+ 
+       global_faults++;
++      if (current->mm == NULL)
++              return;
++
+ 
+       current_interval = global_faults - current->mm->faultstamp;
+