This is a note to let you know that I've just added the patch titled
svcrpc: fix handling of too-short rpc's
to the 3.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
svcrpc-fix-handling-of-too-short-rpc-s.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cf3aa02cb4a0c5af5557dd47f15a08a7df33182a Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
Date: Wed, 26 Jun 2013 11:09:06 -0400
Subject: svcrpc: fix handling of too-short rpc's
From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
commit cf3aa02cb4a0c5af5557dd47f15a08a7df33182a upstream.
If we detect that an rpc is too short, we abort and close the
connection. Except, there's a bug here: we're leaving sk_datalen
nonzero without leaving any pages in the sk_pages array. The most
likely result of the inconsistency is a subsequent crash in
svc_tcp_clear_pages.
Also demote the BUG_ON in svc_tcp_clear_pages to a WARN.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/sunrpc/svcsock.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -917,7 +917,10 @@ static void svc_tcp_clear_pages(struct s
len = svsk->sk_datalen;
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
for (i = 0; i < npages; i++) {
- BUG_ON(svsk->sk_pages[i] == NULL);
+ if (svsk->sk_pages[i] == NULL) {
+ WARN_ON_ONCE(1);
+ continue;
+ }
put_page(svsk->sk_pages[i]);
svsk->sk_pages[i] = NULL;
}
@@ -1092,8 +1095,10 @@ static int svc_tcp_recvfrom(struct svc_r
goto err_noclose;
}
- if (svc_sock_reclen(svsk) < 8)
+ if (svc_sock_reclen(svsk) < 8) {
+ svsk->sk_datalen = 0;
goto err_delete; /* client is nuts. */
+ }
rqstp->rq_arg.len = svsk->sk_datalen;
rqstp->rq_arg.page_base = 0;
Patches currently in stable-queue which might be from bfields@xxxxxxxxxx are
queue-3.10/svcrpc-fix-failures-to-handle-1-uid-s.patch
queue-3.10/svcrpc-fix-handling-of-too-short-rpc-s.patch
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