From: Prasad J Pandit <pjp@fedoraproject.org>

Date: Thu, 7 Apr 2016 12:50:08 +0530

Subject: [PATCH] i386: kvmvapic: initialise imm32 variable

When processing Task Priorty Register(TPR) access, it could leak

automatic stack variable 'imm32' in patch_instruction().

Initialise the variable to avoid it.

Reported by: Donghai Zdh <donghai.zdh@alibaba-inc.com>

Cc: qemu-stable@nongnu.org

Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>

Message-Id: <1460013608-16670-1-git-send-email-ppandit@redhat.com>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

(cherry picked from commit 691a02e2ce0c413236a78dee6f2651c937b09fb0)

---

 hw/i386/kvmvapic.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/i386/kvmvapic.c b/hw/i386/kvmvapic.c

index c69f374..ff1e31a 100644

--- a/hw/i386/kvmvapic.c

+++ b/hw/i386/kvmvapic.c

@@ -394,7 +394,7 @@ static void patch_instruction(VAPICROMState *s, X86CPU *cpu, target_ulong ip)

     CPUX86State *env = &cpu->env;

     VAPICHandlers *handlers;

     uint8_t opcode[2];

-    uint32_t imm32;

+    uint32_t imm32 = 0;

     target_ulong current_pc = 0;

     target_ulong current_cs_base = 0;

     int current_flags = 0;