tree 87e070e4d51fe128214c838f534afe1c28178f19
parent 9ea19481db31d614f729f346bdcf28e4e60ff14a
author Vasiliy Kulikov <segoon@openwall.com> 1289718368 +0000
committer David S. Miller <davem@davemloft.net> 1290025666 -0800

net: ipv4: tcp_probe: cleanup snprintf() use

snprintf() returns number of bytes that were copied if there is no overflow.
This code uses return value as number of copied bytes.  Theoretically format
string '%lu.%09lu %pI4:%u %pI4:%u %d %#x %#x %u %u %u %u\n' may be expanded
up to 163 bytes.  In reality tv.tv_sec is just few bytes instead of 20, 2 ports
are just 5 bytes each instead of 10, length is 5 bytes instead of 10.  The rest
is an unstrusted input.  Theoretically if tv_sec is big then copy_to_user() would
overflow tbuf.

tbuf was increased to fit in 163 bytes.  snprintf() is used to follow return
value semantic.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Signed-off-by: David S. Miller <davem@davemloft.net>