lguest: fix bug in setting guest GDT entry
We kill the guest, but then we blatt random stuff.
Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/lguest/segments.c b/drivers/lguest/segments.c
index 951c57b..ede4658 100644
--- a/drivers/lguest/segments.c
+++ b/drivers/lguest/segments.c
@@ -179,8 +179,10 @@
* We assume the Guest has the same number of GDT entries as the
* Host, otherwise we'd have to dynamically allocate the Guest GDT.
*/
- if (num >= ARRAY_SIZE(cpu->arch.gdt))
+ if (num >= ARRAY_SIZE(cpu->arch.gdt)) {
kill_guest(cpu, "too many gdt entries %i", num);
+ return;
+ }
/* Set it up, then fix it. */
cpu->arch.gdt[num].a = lo;