mctp i2c: Fix hard head TX bounds length check

We should be testing the length before fitting into the u8 byte_count.
This is just a sanity check, the MCTP stack should have limited to MTU
which is checked, and we check consistency later in mctp_i2c_xmit().

Found by Smatch
mctp_i2c_header_create() warn: impossible condition
    '(hdr->byte_count > 255) => (0-255 > 255)'

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/mctp/mctp-i2c.c b/drivers/net/mctp/mctp-i2c.c
index 470682c..baf7afa 100644 (file)
--- a/drivers/net/mctp/mctp-i2c.c
+++ b/drivers/net/mctp/mctp-i2c.c
@@ -537,6 +537,9 @@ static int mctp_i2c_header_create(struct sk_buff *skb, struct net_device *dev,
        struct mctp_hdr *mhdr;
        u8 lldst, llsrc;
 
+       if (len > MCTP_I2C_MAXMTU)
+               return -EMSGSIZE;
+
        lldst = *((u8 *)daddr);
        llsrc = *((u8 *)saddr);
 
@@ -547,8 +550,6 @@ static int mctp_i2c_header_create(struct sk_buff *skb, struct net_device *dev,
        hdr->dest_slave = (lldst << 1) & 0xff;
        hdr->command = MCTP_I2C_COMMANDCODE;
        hdr->byte_count = len + 1;
-       if (hdr->byte_count > MCTP_I2C_MAXBLOCK)
-               return -EMSGSIZE;
        hdr->source_slave = ((llsrc << 1) & 0xff) | 0x01;
        mhdr->ver = 0x01;