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drivers: ipmi: fix off-by-one bounds check that leads to a out-of-bounds write 

The end of buffer check is off-by-one since the check is against
an index that is pre-incremented before a store to buf[]. Fix this
adjusting the bounds check appropriately.

Addresses-Coverity: ("Out-of-bounds write")
Fixes: 51bd6f2915 ("Add support for IPMB driver")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Message-Id: <20200114144031.358003-1-colin.king@canonical.com>
Reviewed-by: Asmaa Mnebhi <asmaa@mellanox.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Colin Ian King 2020-01-14 14:40:31 +00:00 committed by Corey Minyard
parent 6b8526d3ab
commit e0354d147e
1 changed files with 1 additions and 1 deletions
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2
drivers/char/ipmi/ipmb_dev_int.c
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@ -279,7 +279,7 @@ static int ipmb_slave_cb(struct i2c_client *client,
break;
case I2C_SLAVE_WRITE_RECEIVED:
if (ipmb_dev->msg_idx >= sizeof(struct ipmb_msg))
if (ipmb_dev->msg_idx >= sizeof(struct ipmb_msg) - 1)
break;
buf[++ipmb_dev->msg_idx] = *val;