i2c: core-smbus: prevent stack corruption on read I2C_BLOCK_DATA

On a I2C_SMBUS_I2C_BLOCK_DATA read request, if data->block[0] is
greater than I2C_SMBUS_BLOCK_MAX + 1, the underlying I2C driver writes
data out of the msgbuf1 array boundary.

It is possible from a user application to run into that issue by
calling the I2C_SMBUS ioctl with data.block[0] greater than
I2C_SMBUS_BLOCK_MAX + 1.

This patch makes the code compliant with
Documentation/i2c/dev-interface by raising an error when the requested
size is larger than 32 bytes.

Call Trace:
 [<ffffffff8139f695>] dump_stack+0x67/0x92
 [<ffffffff811802a4>] panic+0xc5/0x1eb
 [<ffffffff810ecb5f>] ? vprintk_default+0x1f/0x30
 [<ffffffff817456d3>] ? i2cdev_ioctl_smbus+0x303/0x320
 [<ffffffff8109a68b>] __stack_chk_fail+0x1b/0x20
 [<ffffffff817456d3>] i2cdev_ioctl_smbus+0x303/0x320
 [<ffffffff81745aed>] i2cdev_ioctl+0x4d/0x1e0
 [<ffffffff811f761a>] do_vfs_ioctl+0x2ba/0x490
 [<ffffffff81336e43>] ? security_file_ioctl+0x43/0x60
 [<ffffffff811f7869>] SyS_ioctl+0x79/0x90
 [<ffffffff81a22e97>] entry_SYSCALL_64_fastpath+0x12/0x6a

Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org

diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c
index 4bb9927afd0106f6cf6de9fd433c0b66b18173aa..a1082c04ac5c63c097ac5b0c2d33a7df741d2070 100644 (file)
--- a/drivers/i2c/i2c-core-smbus.c
+++ b/drivers/i2c/i2c-core-smbus.c
@@ -397,16 +397,17 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr,
                                   the underlying bus driver */
                break;
        case I2C_SMBUS_I2C_BLOCK_DATA:
+               if (data->block[0] > I2C_SMBUS_BLOCK_MAX) {
+                       dev_err(&adapter->dev, "Invalid block %s size %d\n",
+                               read_write == I2C_SMBUS_READ ? "read" : "write",
+                               data->block[0]);
+                       return -EINVAL;
+               }
+
                if (read_write == I2C_SMBUS_READ) {
                        msg[1].len = data->block[0];
                } else {
                        msg[0].len = data->block[0] + 1;
-                       if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 1) {
-                               dev_err(&adapter->dev,
-                                       "Invalid block write size %d\n",
-                                       data->block[0]);
-                               return -EINVAL;
-                       }
                        for (i = 1; i <= data->block[0]; i++)
                                msgbuf0[i] = data->block[i];
                }