tree 41b562b598b46c29a3c33a9839debe73a1588850
parent 230d4fa48bd64dbc07b509e0eb0bbc885ddf4cc8
author Christoph Hellwig <hch@lst.de> 1247225622 +0200
committer Anthony Liguori <aliguori@us.ibm.com> 1247246736 -0500

qemu-io: better input validation for vector-based commands

Fix up a couple of issues with validating the input of the various
length arguments for the vectored I/O commands:

 - do the alignment check on each length instead the always 0 count argument
 - use a long long varibale for the cvtnum return value so that we can check
   wether it wasn't a number
 - check for a too large argument instead of truncating it

Also refactor it into a common helper for all four calers and avoid parsing
the numbers twice.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>