This buffer overflow was introduced with
91e0c5f3dad47838cb2ecc1865ce789a0b7182b1
(2.6.24).
Cc: Konrad Rzeszutek Wilk <konrad.w...@oracle.com>
Cc: Jeremy Fitzhardinge <jer...@goop.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: "H. Peter Anvin" <h...@zytor.com>
Cc: x...@kernel.org
Cc: xen-de...@lists.xensource.com
Cc: virtualization@lists.linux-foundation.org
Cc: sta...@vger.kernel.org
Signed-off-by: Tim Gardner <tim.gard...@canonical.com>
---
This patch applies cleanly to 3.1.10 and newer. Requires a backport
for 2.6.24-3.2.y
arch/x86/xen/multicalls.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/xen/multicalls.c b/arch/x86/xen/multicalls.c
index 0d82003..5270407 100644
--- a/arch/x86/xen/multicalls.c
+++ b/arch/x86/xen/multicalls.c
@@ -195,9 +195,10 @@ void xen_mc_callback(void (*fn)(void *), void *data)
struct mc_buffer *b = &__get_cpu_var(mc_buffer);
struct callback *cb;
- if (b->cbidx == MC_BATCH) {
+ if (b->cbidx >= MC_BATCH) {
trace_xen_mc_flush_reason(XEN_MC_FL_CALLBACK);
xen_mc_flush();
+ return;
}
trace_xen_mc_callback(fn, data);
--
1.7.9.5
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