tree fbc2ccfd74de779645192fdcafd1a1e09f92bb85
parent 3e77f661f12b256dbbde4863f18c737ac9c9431a
author Grant Likely <grant.likely@secretlab.ca> 1188433584 -0600
committer Wolfgang Denk <wd@denx.de> 1188458176 +0200

tftp: don't implicity trust the format of recevied packets

The TFTP OACK code trusts that the incoming packet is formated as
ASCII text and can be processed by string functions. It also has a
loop limit overflow bug where if the packet length is less than 8, it
ends up looping over *all* of memory to find the 'blksize' string.

This patch solves the problem by forcing the packet to be null
terminated and using strstr() to search for the sub string.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>