diff options
| author | NeilBrown <neilb@suse.de> | 2007-01-26 00:56:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-26 13:50:59 -0800 |
| commit | 250f3915183d377d36e012bac9caa7345ce465b8 (patch) | |
| tree | e7fd20dfa79a8b4f6435083bf48f4cd3d1836cbf /net/sunrpc | |
| parent | 1a8eff6d977c28162c61c9532ca58634e7090b69 (diff) | |
[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>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/svcsock.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 99f54fb6d66..45120f268d0 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -1278,6 +1278,8 @@ svc_recv(struct svc_rqst *rqstp, long timeout) schedule_timeout_uninterruptible(msecs_to_jiffies(500)); rqstp->rq_pages[i] = p; } + rqstp->rq_pages[i++] = NULL; /* this might be seen in nfs_read_actor */ + BUG_ON(pages >= RPCSVC_MAXPAGES); /* Make arg->head point to first page and arg->pages point to rest */ arg = &rqstp->rq_arg; |