[Qemu-devel] [PATCH v2 04/12] i2c: Add a length check to the SMBus write handling

[minyard@acm.org]

From: Corey Minyard <cminyard@mvista.com>

Avoid an overflow.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
---
 hw/i2c/smbus_slave.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/hw/i2c/smbus_slave.c b/hw/i2c/smbus_slave.c
index 83ca041b5d..fa988919d8 100644
--- a/hw/i2c/smbus_slave.c
+++ b/hw/i2c/smbus_slave.c
@@ -182,7 +182,11 @@ static int smbus_i2c_send(I2CSlave *s, uint8_t data)
     switch (dev->mode) {
     case SMBUS_WRITE_DATA:
         DPRINTF("Write data %02x\n", data);
-        dev->data_buf[dev->data_len++] = data;
+        if (dev->data_len >= sizeof(dev->data_buf)) {
+            BADF("Too many bytes sent\n");
+        } else {
+            dev->data_buf[dev->data_len++] = data;
+        }
         break;
 
     default:
-- 
2.17.1