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i2c: ismt: Return EMSGSIZE for block reads with bogus length

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Compare the number of bytes actually seen on the wire to the byte
count field returned by the slave device.

Previously we just overwrote the byte count returned by the slave
with the real byte count and let the caller figure out if the
message was sane.

Signed-off-by: Stephen Douthit <stephend@adiengineering.com>
Tested-by: Dan Priamo <danp@adiengineering.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
This commit is contained in:
Stephen Douthit 2017-08-07 17:11:00 -04:00 committed by Wolfram Sang
parent b6c159a9cb
commit ba201c4f5e
1 changed files with 3 additions and 1 deletions
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4
drivers/i2c/busses/i2c-ismt.c
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@ -341,8 +341,10 @@ static int ismt_process_desc(const struct ismt_desc *desc,
break;
case I2C_SMBUS_BLOCK_DATA:
case I2C_SMBUS_I2C_BLOCK_DATA:
if (desc->rxbytes != dma_buffer[0] + 1)
return -EMSGSIZE;
memcpy(data->block, dma_buffer, desc->rxbytes);
data->block[0] = desc->rxbytes - 1;
break;
}
return 0;