i2c: xgene-slimpro: Fix out-of-bounds bug in xgene_slimpro_i2c_xfer() (#100)

The data->block[0] variable comes from user and is a number between
0-255. Without proper check, the variable may be very large to cause
an out-of-bounds when performing memcpy in slimpro_i2c_blkwr.

Fix this bug by checking the value of writelen.

Fixes: f6505fbabc42 ("i2c: add SLIMpro I2C device driver on APM X-Gene platform")

Cc: [email protected]
Reviewed-by: Andi Shyti <[email protected]>

Signed-off-by: Wei Chen <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
Co-authored-by: Wei Chen <[email protected]>
1 file changed