kexec-tools: check for underun and only read required data

> Make sure that there is at least 8 bytes available to be read,
> and only read exactly 8 bytes.
>
> Signed-off-by: Simon Horman <horms@verge.net.au>

Hmm. I think this is not the correct place to have this check. 
variable len can take values anywhere from 4 to 80. With this
patch applied the kexec tools fails to load the panic kernel.

old:/home/sachin/b # /tmp/run1
get memory ranges:1
Modified cmdline:root=/dev/sda3  diag elfcorehdr=39100K savemaxmem=3840M
unrecoverable error: not enough data for mem property
old:/home/sachin/b #

The correct place should be after the strncmp() call.

Something like the attached patch.

Signed-off-by : Sachin Sant <sachinp@in.ibm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

0 files changed, 0 insertions, 0 deletions