tree e7fd20dfa79a8b4f6435083bf48f4cd3d1836cbf
parent 1a8eff6d977c28162c61c9532ca58634e7090b69
author NeilBrown <neilb@suse.de> 1169801819 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1169848259 -0800

[PATCH] knfsd: fix an NFSD bug with full sized, non-page-aligned reads

NFSd assumes that largest number of pages that will be needed for a
request+response is 2+N where N pages is the size of the largest permitted
read/write request.  The '2' are 1 for the non-data part of the request, and 1
for the non-data part of the reply.

However, when a read request is not page-aligned, and we choose to use
->sendfile to send it directly from the page cache, we may need N+1 pages to
hold the whole reply.  This can overflow and array and cause an Oops.

This patch increases size of the array for holding pages by one and makes sure
that entry is NULL when it is not in use.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>