[Qemu-devel] [PATCH 17/23] ssi-sd: fix buffer overrun on invalid state load

[Michael S. Tsirkin]

CVE-2013-4537

s->arglen is taken from wire and used as idx
in ssi_sd_transfer().

Validate it before access.

Signed-off-by: Michael S. Tsirkin <address@hidden>
---
 hw/sd/ssi-sd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c
index 1bb56c4..bb7bd69 100644
--- a/hw/sd/ssi-sd.c
+++ b/hw/sd/ssi-sd.c
@@ -230,6 +230,9 @@ static int ssi_sd_load(QEMUFile *f, void *opaque, int 
version_id)
     for (i = 0; i < 5; i++)
         s->response[i] = qemu_get_be32(f);
     s->arglen = qemu_get_be32(f);
+    if (s->mode == SSI_SD_CMDARG && s->arglen > ARRAY_SIZE(s->cmdarg)) {
+        return -EINVAL;
+    }
     s->response_pos = qemu_get_be32(f);
     s->stopping = qemu_get_be32(f);
 
-- 
MST