[Lguest] [PATCH] lguest: fix bug in setting guest GDT entry
Rusty Russell
rusty at rustcorp.com.au
Mon Jan 4 19:56:14 EST 2010
We kill the guest, but then we blatt random stuff.
Reported-by: Dan Carpenter <error27 at gmail.com>
Signed-off-by: Rusty Russell <rusty at rustcorp.com.au>
Cc: stable at kernel.org
---
drivers/lguest/segments.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/lguest/segments.c b/drivers/lguest/segments.c
--- a/drivers/lguest/segments.c
+++ b/drivers/lguest/segments.c
@@ -179,8 +179,10 @@ void load_guest_gdt_entry(struct lg_cpu
* 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;
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